diff --git a/js/src/tests/Makefile.in b/js/src/tests/Makefile.in
index f93d17d8c5a0..34d1aeb4a86f 100644
--- a/js/src/tests/Makefile.in
+++ b/js/src/tests/Makefile.in
@@ -16,6 +16,7 @@ TEST_FILES = \
   shell/ \
   test/ \
   test262/ \
+  whatwg/ \
   $(NULL)
 
 PKG_STAGE = $(DIST)/test-stage
diff --git a/js/src/tests/browser.js b/js/src/tests/browser.js
index 7df00d06e1f6..8f267e1c0e4f 100644
--- a/js/src/tests/browser.js
+++ b/js/src/tests/browser.js
@@ -38,6 +38,7 @@
   var URL = global.URL;
 
   var document = global.document;
+  var documentAll = global.document.all;
   var documentDocumentElement = global.document.documentElement;
   var DocumentCreateElement = global.document.createElement;
 
@@ -194,6 +195,15 @@
 
     global.detachArrayBuffer = detachArrayBuffer;
   }
+
+  var createIsHTMLDDA = global.createIsHTMLDDA;
+  if (typeof createIsHTMLDDA !== "function") {
+    createIsHTMLDDA = function() {
+      return documentAll;
+    };
+
+    global.createIsHTMLDDA = createIsHTMLDDA;
+  }
 })(this);
 
 (function(global) {
diff --git a/js/src/tests/jstests.list b/js/src/tests/jstests.list
index faab36e8f636..688c50d7e697 100644
--- a/js/src/tests/jstests.list
+++ b/js/src/tests/jstests.list
@@ -89,6 +89,28 @@ skip-if(!xulRuntime.shell) script test262/language/global-code/script-decl-func-
 skip-if(!xulRuntime.shell) script test262/language/global-code/script-decl-lex.js
 skip-if(!xulRuntime.shell) script test262/language/global-code/script-decl-var-err.js
 
+# Global var-bindings are configurable in a browser environment.
+skip-if(!xulRuntime.shell) script test262/annexB/language/global-code/block-decl-global-existing-global-init.js
+skip-if(!xulRuntime.shell) script test262/annexB/language/global-code/block-decl-global-init.js
+skip-if(!xulRuntime.shell) script test262/annexB/language/global-code/if-decl-else-decl-a-global-existing-global-init.js
+skip-if(!xulRuntime.shell) script test262/annexB/language/global-code/if-decl-else-decl-a-global-init.js
+skip-if(!xulRuntime.shell) script test262/annexB/language/global-code/if-decl-else-decl-b-global-existing-global-init.js
+skip-if(!xulRuntime.shell) script test262/annexB/language/global-code/if-decl-else-decl-b-global-init.js
+skip-if(!xulRuntime.shell) script test262/annexB/language/global-code/if-decl-else-stmt-global-existing-global-init.js
+skip-if(!xulRuntime.shell) script test262/annexB/language/global-code/if-decl-else-stmt-global-init.js
+skip-if(!xulRuntime.shell) script test262/annexB/language/global-code/if-decl-no-else-global-existing-global-init.js
+skip-if(!xulRuntime.shell) script test262/annexB/language/global-code/if-decl-no-else-global-init.js
+skip-if(!xulRuntime.shell) script test262/annexB/language/global-code/if-stmt-else-decl-global-existing-global-init.js
+skip-if(!xulRuntime.shell) script test262/annexB/language/global-code/if-stmt-else-decl-global-init.js
+skip-if(!xulRuntime.shell) script test262/annexB/language/global-code/switch-case-global-existing-global-init.js
+skip-if(!xulRuntime.shell) script test262/annexB/language/global-code/switch-case-global-init.js
+skip-if(!xulRuntime.shell) script test262/annexB/language/global-code/switch-dflt-global-existing-global-init.js
+skip-if(!xulRuntime.shell) script test262/annexB/language/global-code/switch-dflt-global-init.js
+skip-if(!xulRuntime.shell) script test262/language/eval-code/direct/var-env-var-init-global-exstng.js
+skip-if(!xulRuntime.shell) script test262/language/eval-code/indirect/var-env-var-init-global-exstng.js
+skip-if(!xulRuntime.shell) script test262/language/global-code/decl-func.js
+skip-if(!xulRuntime.shell) script test262/language/global-code/decl-var.js
+
 
 ##################################################
 # Test262 tests skipped due to SpiderMonkey bugs #
@@ -504,3 +526,6 @@ skip script test262/harness/detachArrayBuffer.js
 # Tests disabled due to invalid test expectations  #
 ####################################################
 
+# https://github.com/tc39/test262/pull/1965
+skip script test262/language/expressions/dynamic-import/indirect-resolution.js
+skip script test262/language/expressions/dynamic-import/namespace/default-property-not-set-own.js
diff --git a/js/src/tests/non262/Date/15.9.4.2.js b/js/src/tests/non262/Date/15.9.4.2.js
index bd60fd33694d..f1cca969f74b 100644
--- a/js/src/tests/non262/Date/15.9.4.2.js
+++ b/js/src/tests/non262/Date/15.9.4.2.js
@@ -39,16 +39,17 @@ function TZAtDate(d){
   return d.getTimezoneOffset() * 60000;
 }
 
-function TZInMonth(month){
-  return TZAtDate(new Date(dd(2009,month,1,0,0,0,0)));
+function TZInMonth(month, year){
+  return TZAtDate(new Date(dd(year,month,1,0,0,0,0)));
 }
 
 function test()
 {
   printBugNumber(BUGNUMBER);
  
-  JanTZ = TZInMonth(1);
-  JulTZ = TZInMonth(7);
+  Jan1970TZ = TZInMonth(1, 1970);
+  Jan2009TZ = TZInMonth(1, 2009);
+  Jul2009TZ = TZInMonth(7, 2009);
   CurrTZ = TZAtDate(new Date());
 
   // formats with explicit timezone
@@ -69,21 +70,21 @@ function test()
   check("T19:53+12:00",                  dd(1970,1,1,7,53,0,0));
 
   // formats without timezone uses the timezone as at that date
-  check("2009-07-23T19:53:21.001",       dd(2009,7,23,19,53,21,1)+JulTZ);
-  check("2009-07-23T19:53:21",           dd(2009,7,23,19,53,21,0)+JulTZ);
-  check("2009-07-23T19:53",              dd(2009,7,23,19,53,0,0)+JulTZ);
+  check("2009-07-23T19:53:21.001",       dd(2009,7,23,19,53,21,1)+Jul2009TZ);
+  check("2009-07-23T19:53:21",           dd(2009,7,23,19,53,21,0)+Jul2009TZ);
+  check("2009-07-23T19:53",              dd(2009,7,23,19,53,0,0)+Jul2009TZ);
 
-  check("2009-07T19:53:21.001",          dd(2009,7,1,19,53,21,1)+JulTZ);
-  check("2009-07T19:53:21",              dd(2009,7,1,19,53,21,0)+JulTZ);
-  check("2009-07T19:53",                 dd(2009,7,1,19,53,0,0)+JulTZ);
+  check("2009-07T19:53:21.001",          dd(2009,7,1,19,53,21,1)+Jul2009TZ);
+  check("2009-07T19:53:21",              dd(2009,7,1,19,53,21,0)+Jul2009TZ);
+  check("2009-07T19:53",                 dd(2009,7,1,19,53,0,0)+Jul2009TZ);
 
-  check("2009T19:53:21.001",             dd(2009,1,1,19,53,21,1)+JanTZ);
-  check("2009T19:53:21",                 dd(2009,1,1,19,53,21,0)+JanTZ);
-  check("2009T19:53",                    dd(2009,1,1,19,53,0,0)+JanTZ);
+  check("2009T19:53:21.001",             dd(2009,1,1,19,53,21,1)+Jan2009TZ);
+  check("2009T19:53:21",                 dd(2009,1,1,19,53,21,0)+Jan2009TZ);
+  check("2009T19:53",                    dd(2009,1,1,19,53,0,0)+Jan2009TZ);
 
-  check("T19:53:21.001",                 dd(1970,1,1,19,53,21,1)+JanTZ);
-  check("T19:53:21",                     dd(1970,1,1,19,53,21,0)+JanTZ);
-  check("T19:53",                        dd(1970,1,1,19,53,0,0)+JanTZ);
+  check("T19:53:21.001",                 dd(1970,1,1,19,53,21,1)+Jan1970TZ);
+  check("T19:53:21",                     dd(1970,1,1,19,53,21,0)+Jan1970TZ);
+  check("T19:53",                        dd(1970,1,1,19,53,0,0)+Jan1970TZ);
 
   // with no time at all assume UTC
   check("2009-07-23",                    dd(2009,7,23,0,0,0,0));
diff --git a/js/src/tests/non262/Date/browser.js b/js/src/tests/non262/Date/browser.js
index 5665e7ed448b..e2c7f6d3170f 100644
--- a/js/src/tests/non262/Date/browser.js
+++ b/js/src/tests/non262/Date/browser.js
@@ -1,3 +1,12 @@
+if (typeof getDefaultLocale === "undefined") {
+    var getDefaultLocale = SpecialPowers.Cu.getJSTestingFunctions().getDefaultLocale;
+}
+if (typeof setDefaultLocale === "undefined") {
+    var setDefaultLocale = SpecialPowers.Cu.getJSTestingFunctions().setDefaultLocale;
+}
+if (typeof getTimeZone === "undefined") {
+    var getTimeZone = SpecialPowers.Cu.getJSTestingFunctions().getTimeZone;
+}
 if (typeof setTimeZone === "undefined") {
     var setTimeZone = SpecialPowers.Cu.getJSTestingFunctions().setTimeZone;
 }
diff --git a/js/src/tests/ecma_6/Date/parse-from-tostring-methods.js b/js/src/tests/non262/Date/parse-from-tostring-methods.js
similarity index 68%
rename from js/src/tests/ecma_6/Date/parse-from-tostring-methods.js
rename to js/src/tests/non262/Date/parse-from-tostring-methods.js
index fb691ed661da..b6bf577bb079 100644
--- a/js/src/tests/ecma_6/Date/parse-from-tostring-methods.js
+++ b/js/src/tests/non262/Date/parse-from-tostring-methods.js
@@ -15,7 +15,14 @@ for (let date of dates) {
 
     // Ensure parsing the results of toString(), toUTCString(), and toISOString()
     // gives the same time value as required by 20.3.3.2 Date.parse.
-    assertEq(Date.parse(d.toString()), timeValue, `Cannot parse from toString() of "${date}"`);
+    //
+    // Additional requirement not present in ES2019 draft rev 7acacc524213058a2368b5fa751fac7ea08ba230:
+    // The time zone offset must not contain seconds (or milliseconds) for |Date.parse(x.toString())|
+    // to be equal to |x.valueOf()|.
+    let tz = d.getTimezoneOffset();
+    if (Math.trunc(tz) === tz) {
+        assertEq(Date.parse(d.toString()), timeValue, `Cannot parse from toString() of "${date}"`);
+    }
     assertEq(Date.parse(d.toUTCString()), timeValue, `Cannot parse from toUTCString() of "${date}"`);
     assertEq(Date.parse(d.toISOString()), timeValue, `Cannot parse from toISOString() of "${date}"`);
 }
diff --git a/js/src/tests/non262/ReadableStream/subclassing.js b/js/src/tests/non262/ReadableStream/subclassing.js
index 829b7cf56332..e56fe868db16 100644
--- a/js/src/tests/non262/ReadableStream/subclassing.js
+++ b/js/src/tests/non262/ReadableStream/subclassing.js
@@ -1,3 +1,5 @@
+// |reftest| skip-if(!xulRuntime.shell) -- needs drainJobQueue
+
 // Spot-check subclassing of stream constructors.
 
 // ReadableStream can be subclassed.
diff --git a/js/src/tests/non262/String/replace-rope-empty.js b/js/src/tests/non262/String/replace-rope-empty.js
index 89f9bc83b3fd..81f7f7d659fc 100644
--- a/js/src/tests/non262/String/replace-rope-empty.js
+++ b/js/src/tests/non262/String/replace-rope-empty.js
@@ -1,3 +1,5 @@
+// |reftest| skip-if(!xulRuntime.shell)
+
 var BUGNUMBER = 1509768;
 var summary = "String#replace with an empty string pattern on a rope should prepend the replacement string.";
 
diff --git a/js/src/tests/non262/String/ropes.js b/js/src/tests/non262/String/ropes.js
index 8af095b941a6..dc55e247fac9 100644
--- a/js/src/tests/non262/String/ropes.js
+++ b/js/src/tests/non262/String/ropes.js
@@ -1,5 +1,12 @@
 print("Stress test of ropes");
 
+if (typeof newRope === "undefined") {
+    var newRope = SpecialPowers.Cu.getJSTestingFunctions().newRope;
+}
+if (typeof ensureFlatString === "undefined") {
+    var ensureFlatString = SpecialPowers.Cu.getJSTestingFunctions().ensureFlatString;
+}
+
 function createRopes() {
     const ropes = {};
 
diff --git a/js/src/tests/non262/lexical-environment/block-scoped-functions-annex-b-with.js b/js/src/tests/non262/lexical-environment/block-scoped-functions-annex-b-with.js
index d9bdd98dc973..35df9de86ef7 100644
--- a/js/src/tests/non262/lexical-environment/block-scoped-functions-annex-b-with.js
+++ b/js/src/tests/non262/lexical-environment/block-scoped-functions-annex-b-with.js
@@ -1,10 +1,13 @@
+// Global functions are configurable in a browser environment.
+var functionDeclarationsConfigurable = typeof document !== "undefined";
+
 var o = { f: "string-f" };
 with (o) {
   var desc = Object.getOwnPropertyDescriptor(this, "f");
   assertEq(desc.value, undefined);
   assertEq(desc.writable, true);
   assertEq(desc.enumerable, true);
-  assertEq(desc.configurable, false);
+  assertEq(desc.configurable, functionDeclarationsConfigurable);
   function f() {
     return "fun-f";
   }
diff --git a/js/src/tests/non262/regress/regress-1456512-greyreadbarrier.js b/js/src/tests/non262/regress/regress-1456512-greyreadbarrier.js
index bb883eeffbea..7b145363ce7c 100644
--- a/js/src/tests/non262/regress/regress-1456512-greyreadbarrier.js
+++ b/js/src/tests/non262/regress/regress-1456512-greyreadbarrier.js
@@ -1,3 +1,5 @@
+// |reftest| skip-if(!xulRuntime.shell) -- needs grayRoot
+
 var wm = new WeakMap();
 grayRoot().map = wm;
 wm = null;
diff --git a/js/src/tests/non262/regress/regress-1456512.js b/js/src/tests/non262/regress/regress-1456512.js
index 87faeca39ad1..24a157ac2472 100644
--- a/js/src/tests/non262/regress/regress-1456512.js
+++ b/js/src/tests/non262/regress/regress-1456512.js
@@ -1,3 +1,5 @@
+// |reftest| skip-if(!xulRuntime.shell) -- needs grayRoot
+
 /* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
diff --git a/js/src/tests/non262/regress/regress-1463421.js b/js/src/tests/non262/regress/regress-1463421.js
index e037ade3b9fd..68a4d5977cee 100644
--- a/js/src/tests/non262/regress/regress-1463421.js
+++ b/js/src/tests/non262/regress/regress-1463421.js
@@ -1,3 +1,5 @@
+// |reftest| skip-if(!xulRuntime.shell) -- needs grayRoot
+
 /* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
diff --git a/js/src/tests/non262/regress/regress-1476383-calloc-exc.js b/js/src/tests/non262/regress/regress-1476383-calloc-exc.js
index 72b8c1df6ffc..3a6a0eb66332 100644
--- a/js/src/tests/non262/regress/regress-1476383-calloc-exc.js
+++ b/js/src/tests/non262/regress/regress-1476383-calloc-exc.js
@@ -1,7 +1,4 @@
-if (!this.oomTest) {
-    this.reportCompare && reportCompare(true, true);
-    quit(0);
-}
+// |reftest| skip-if(!this.hasOwnProperty("oomTest"))
 
 let lfPreamble = `
 `;
diff --git a/js/src/tests/test262-update.py b/js/src/tests/test262-update.py
index a6abb86b5a73..13b45c6b5af3 100755
--- a/js/src/tests/test262-update.py
+++ b/js/src/tests/test262-update.py
@@ -26,7 +26,6 @@ UNSUPPORTED_FEATURES = set([
     "class-static-fields-private",
     "class-methods-private",
     "class-static-methods-private",
-    "dynamic-import",
     "regexp-dotall",
     "regexp-lookbehind",
     "regexp-named-groups",
@@ -44,6 +43,7 @@ FEATURE_CHECK_NEEDED = {
     "SharedArrayBuffer": "!this.hasOwnProperty('SharedArrayBuffer')",
     "Intl.ListFormat": "!Intl.hasOwnProperty('ListFormat')",
     "Intl.Segmenter": "!Intl.hasOwnProperty('Segmenter')",
+    "dynamic-import": "!xulRuntime.shell",
 }
 RELEASE_OR_BETA = set()
 
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/always-create-new-promise.js b/js/src/tests/test262/language/expressions/dynamic-import/always-create-new-promise.js
index cb21cda819e5..772d93a08072 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/always-create-new-promise.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/always-create-new-promise.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assign-expr-get-value-abrupt-throws.js b/js/src/tests/test262/language/expressions/dynamic-import/assign-expr-get-value-abrupt-throws.js
index 905ae0909950..b27bb09176d2 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assign-expr-get-value-abrupt-throws.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assign-expr-get-value-abrupt-throws.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/additive-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/additive-expr.js
index ba1397507f49..44618c368a17 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/additive-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/additive-expr.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/array-literal.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/array-literal.js
index 12ae65a44b86..6f78c3c19fac 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/array-literal.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/array-literal.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/arrow-function.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/arrow-function.js
index 9f79983e6e51..0fac76c22250 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/arrow-function.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/arrow-function.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/await-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/await-expr.js
index 998d7f6a3616..980201689429 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/await-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/await-expr.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/await-identifier.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/await-identifier.js
index 7ceeaa2ce4e6..6659d6446743 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/await-identifier.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/await-identifier.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/call-expr-arguments.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/call-expr-arguments.js
index 408da815c06e..29b28dca97a6 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/call-expr-arguments.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/call-expr-arguments.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/call-expr-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/call-expr-expr.js
index 12d29ee378ae..2372ebf1b357 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/call-expr-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/call-expr-expr.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/call-expr-identifier.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/call-expr-identifier.js
index 8e0ed7f4191b..1f436117592c 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/call-expr-identifier.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/call-expr-identifier.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/cover-call-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/cover-call-expr.js
index 46a4b4a90f29..2586ee27fcd5 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/cover-call-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/cover-call-expr.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/cover-parenthesized-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/cover-parenthesized-expr.js
index 029c1fff6693..50771e0f3b0f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/cover-parenthesized-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/cover-parenthesized-expr.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/identifier.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/identifier.js
index 00fca55e4dfa..54fead02aea8 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/identifier.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/identifier.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/import-meta.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/import-meta.js
index 0a1c2ab8542d..4a6ec4dfd340 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/import-meta.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/import-meta.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/lhs-assign-operator-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/lhs-assign-operator-assign-expr.js
index a4ce9102c57f..0bc244fca6c2 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/lhs-assign-operator-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/lhs-assign-operator-assign-expr.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/lhs-eq-assign-expr-nostrict.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/lhs-eq-assign-expr-nostrict.js
index ed95de271eb8..d4fa78057bac 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/lhs-eq-assign-expr-nostrict.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/lhs-eq-assign-expr-nostrict.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/lhs-eq-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/lhs-eq-assign-expr.js
index 1c86637ecc3c..b22c8f1a9bf2 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/lhs-eq-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/lhs-eq-assign-expr.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/logical-and-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/logical-and-expr.js
index c3dafff48eae..786ef99bab12 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/logical-and-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/logical-and-expr.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/logical-or-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/logical-or-expr.js
index ef21597dbed3..770200523189 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/logical-or-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/logical-or-expr.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/member-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/member-expr.js
index dc08539f4d9a..a53e74bac408 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/member-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/member-expr.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/new-target.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/new-target.js
index 4151107b142d..07fdc9b9b45a 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/new-target.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/new-target.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/object-literal.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/object-literal.js
index 2da6a886745e..adeea5d2b08a 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/object-literal.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/object-literal.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/tagged-function-call.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/tagged-function-call.js
index 5358593582b6..a11df215cb3c 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/tagged-function-call.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/tagged-function-call.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/ternary.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/ternary.js
index 1494ba394df5..2627012804a0 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/ternary.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/ternary.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/this.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/this.js
index 09be936788b7..5e5b4929f91b 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/this.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/this.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/unary-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/unary-expr.js
index 88aa3dbcb556..b1959ca4bdc7 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/unary-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/unary-expr.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/yield-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/yield-assign-expr.js
index be3749f82a3a..41e7685ec2ef 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/yield-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/yield-assign-expr.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/yield-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/yield-expr.js
index 655b58ce99f0..c856936303ae 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/yield-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/yield-expr.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/yield-identifier.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/yield-identifier.js
index 09c761e22568..0c65ea94870d 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/yield-identifier.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/yield-identifier.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/yield-star.js b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/yield-star.js
index 8fba54b3881a..fc095af9be1e 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/yield-star.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/assignment-expression/yield-star.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/await-import-evaluation.js b/js/src/tests/test262/language/expressions/dynamic-import/await-import-evaluation.js
index 26326006f5f6..bbc16288fd3b 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/await-import-evaluation.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/await-import-evaluation.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-eval-rqstd-abrupt-typeerror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-eval-rqstd-abrupt-typeerror.js
index 0f7bac97787a..0e9e95d1eaec 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-eval-rqstd-abrupt-typeerror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-eval-rqstd-abrupt-typeerror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-typeerror.case
 // - src/dynamic-import/catch/nested-arrow.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-eval-rqstd-abrupt-urierror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-eval-rqstd-abrupt-urierror.js
index 3bdc99e8b0d4..0ba57f4c8e7f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-eval-rqstd-abrupt-urierror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-eval-rqstd-abrupt-urierror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-urierror.case
 // - src/dynamic-import/catch/nested-arrow.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-eval-script-code-target.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-eval-script-code-target.js
index 9efd719ac04e..1e7c03bb8444 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-eval-script-code-target.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-eval-script-code-target.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-target.case
 // - src/dynamic-import/catch/nested-arrow.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-file-does-not-exist.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-file-does-not-exist.js
index e20fea77bb00..3712e6198874 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-file-does-not-exist.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-file-does-not-exist.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/file-does-not-exist.case
 // - src/dynamic-import/catch/nested-arrow.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-instn-iee-err-ambiguous-import.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-instn-iee-err-ambiguous-import.js
index c34baf6e113e..f677d23f98f9 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-instn-iee-err-ambiguous-import.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-instn-iee-err-ambiguous-import.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-ambiguous-import.case
 // - src/dynamic-import/catch/nested-arrow.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-instn-iee-err-circular.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-instn-iee-err-circular.js
index e5e65ef18504..21cc6f7f60a9 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-instn-iee-err-circular.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-instn-iee-err-circular.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-circular.case
 // - src/dynamic-import/catch/nested-arrow.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-specifier-tostring-abrupt-rejects.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-specifier-tostring-abrupt-rejects.js
index c5ed7e5264bd..00e94f2bb6bf 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-specifier-tostring-abrupt-rejects.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-arrow-import-catch-specifier-tostring-abrupt-rejects.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring-abrupt-rejects.case
 // - src/dynamic-import/catch/nested-arrow.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-eval-rqstd-abrupt-typeerror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-eval-rqstd-abrupt-typeerror.js
index 03f0780f476d..aa958e030840 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-eval-rqstd-abrupt-typeerror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-eval-rqstd-abrupt-typeerror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-typeerror.case
 // - src/dynamic-import/catch/nested-async-arrow-fn-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-eval-rqstd-abrupt-urierror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-eval-rqstd-abrupt-urierror.js
index 398935712cb9..be862d7f9ed7 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-eval-rqstd-abrupt-urierror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-eval-rqstd-abrupt-urierror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-urierror.case
 // - src/dynamic-import/catch/nested-async-arrow-fn-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-eval-script-code-target.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-eval-script-code-target.js
index d8edcbefe7cf..33ad5d76e531 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-eval-script-code-target.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-eval-script-code-target.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-target.case
 // - src/dynamic-import/catch/nested-async-arrow-fn-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-file-does-not-exist.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-file-does-not-exist.js
index 7f373e27bc1d..ffc37189f21d 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-file-does-not-exist.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-file-does-not-exist.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/file-does-not-exist.case
 // - src/dynamic-import/catch/nested-async-arrow-fn-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-instn-iee-err-ambiguous-import.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-instn-iee-err-ambiguous-import.js
index ef8f81e16102..00cd2e3c6898 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-instn-iee-err-ambiguous-import.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-instn-iee-err-ambiguous-import.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-ambiguous-import.case
 // - src/dynamic-import/catch/nested-async-arrow-fn-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-instn-iee-err-circular.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-instn-iee-err-circular.js
index b5c8b1dd114e..559746ebe7c8 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-instn-iee-err-circular.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-instn-iee-err-circular.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-circular.case
 // - src/dynamic-import/catch/nested-async-arrow-fn-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-specifier-tostring-abrupt-rejects.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-specifier-tostring-abrupt-rejects.js
index 416932c3f30c..cc9acd3ed4e5 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-specifier-tostring-abrupt-rejects.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-await-specifier-tostring-abrupt-rejects.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring-abrupt-rejects.case
 // - src/dynamic-import/catch/nested-async-arrow-fn-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-eval-rqstd-abrupt-typeerror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-eval-rqstd-abrupt-typeerror.js
index 9578a8602755..7cb7583c3c48 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-eval-rqstd-abrupt-typeerror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-eval-rqstd-abrupt-typeerror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-typeerror.case
 // - src/dynamic-import/catch/nested-async-arrow-fn-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-eval-rqstd-abrupt-urierror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-eval-rqstd-abrupt-urierror.js
index c336582f1087..1627d97c07bd 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-eval-rqstd-abrupt-urierror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-eval-rqstd-abrupt-urierror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-urierror.case
 // - src/dynamic-import/catch/nested-async-arrow-fn-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-eval-script-code-target.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-eval-script-code-target.js
index 6a99a9f7b18d..d68aa38ab93d 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-eval-script-code-target.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-eval-script-code-target.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-target.case
 // - src/dynamic-import/catch/nested-async-arrow-fn-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-file-does-not-exist.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-file-does-not-exist.js
index a6128b230bc7..82240ad8ec00 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-file-does-not-exist.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-file-does-not-exist.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/file-does-not-exist.case
 // - src/dynamic-import/catch/nested-async-arrow-fn-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-instn-iee-err-ambiguous-import.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-instn-iee-err-ambiguous-import.js
index f7ae233728d7..8c9b043135fc 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-instn-iee-err-ambiguous-import.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-instn-iee-err-ambiguous-import.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-ambiguous-import.case
 // - src/dynamic-import/catch/nested-async-arrow-fn-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-instn-iee-err-circular.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-instn-iee-err-circular.js
index 634db6b198dd..4bfb8ca34ab7 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-instn-iee-err-circular.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-instn-iee-err-circular.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-circular.case
 // - src/dynamic-import/catch/nested-async-arrow-fn-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-specifier-tostring-abrupt-rejects.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-specifier-tostring-abrupt-rejects.js
index 35c45d55f0d1..e724ac0508b0 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-specifier-tostring-abrupt-rejects.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-arrow-function-return-await-specifier-tostring-abrupt-rejects.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring-abrupt-rejects.case
 // - src/dynamic-import/catch/nested-async-arrow-fn-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-eval-rqstd-abrupt-typeerror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-eval-rqstd-abrupt-typeerror.js
index 91f8f81a3ca4..698fb289e9d2 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-eval-rqstd-abrupt-typeerror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-eval-rqstd-abrupt-typeerror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-typeerror.case
 // - src/dynamic-import/catch/nested-async-function-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-eval-rqstd-abrupt-urierror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-eval-rqstd-abrupt-urierror.js
index e9daf07b5e75..214fc44b0b07 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-eval-rqstd-abrupt-urierror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-eval-rqstd-abrupt-urierror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-urierror.case
 // - src/dynamic-import/catch/nested-async-function-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-eval-script-code-target.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-eval-script-code-target.js
index 8f296e149655..57ae7745ea2f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-eval-script-code-target.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-eval-script-code-target.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-target.case
 // - src/dynamic-import/catch/nested-async-function-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-file-does-not-exist.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-file-does-not-exist.js
index dc7aed766ddc..99fdb38a976b 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-file-does-not-exist.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-file-does-not-exist.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/file-does-not-exist.case
 // - src/dynamic-import/catch/nested-async-function-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-instn-iee-err-ambiguous-import.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-instn-iee-err-ambiguous-import.js
index 1552006ea947..ab17ffa7b35a 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-instn-iee-err-ambiguous-import.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-instn-iee-err-ambiguous-import.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-ambiguous-import.case
 // - src/dynamic-import/catch/nested-async-function-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-instn-iee-err-circular.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-instn-iee-err-circular.js
index 83fdcad17d24..f76b24a2e553 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-instn-iee-err-circular.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-instn-iee-err-circular.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-circular.case
 // - src/dynamic-import/catch/nested-async-function-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-specifier-tostring-abrupt-rejects.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-specifier-tostring-abrupt-rejects.js
index 64e013be1139..7532c64bea7c 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-specifier-tostring-abrupt-rejects.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-await-specifier-tostring-abrupt-rejects.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring-abrupt-rejects.case
 // - src/dynamic-import/catch/nested-async-function-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-eval-rqstd-abrupt-typeerror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-eval-rqstd-abrupt-typeerror.js
index 308d152f79d7..545eeb5378f8 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-eval-rqstd-abrupt-typeerror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-eval-rqstd-abrupt-typeerror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-typeerror.case
 // - src/dynamic-import/catch/nested-async-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-eval-rqstd-abrupt-urierror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-eval-rqstd-abrupt-urierror.js
index 6d0ce6732a13..be9357607f28 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-eval-rqstd-abrupt-urierror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-eval-rqstd-abrupt-urierror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-urierror.case
 // - src/dynamic-import/catch/nested-async-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-eval-script-code-target.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-eval-script-code-target.js
index 22ea0f87fbee..b8a26d49c1da 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-eval-script-code-target.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-eval-script-code-target.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-target.case
 // - src/dynamic-import/catch/nested-async-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-file-does-not-exist.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-file-does-not-exist.js
index cb69b14cefaf..e3c8b2e61e21 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-file-does-not-exist.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-file-does-not-exist.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/file-does-not-exist.case
 // - src/dynamic-import/catch/nested-async-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-instn-iee-err-ambiguous-import.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-instn-iee-err-ambiguous-import.js
index 07bbf77b834d..9668e1435425 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-instn-iee-err-ambiguous-import.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-instn-iee-err-ambiguous-import.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-ambiguous-import.case
 // - src/dynamic-import/catch/nested-async-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-instn-iee-err-circular.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-instn-iee-err-circular.js
index 91066c830f52..32001b482a3c 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-instn-iee-err-circular.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-instn-iee-err-circular.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-circular.case
 // - src/dynamic-import/catch/nested-async-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-eval-rqstd-abrupt-typeerror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-eval-rqstd-abrupt-typeerror.js
index 2fb6935ac1b9..a4be9d1b9715 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-eval-rqstd-abrupt-typeerror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-eval-rqstd-abrupt-typeerror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-typeerror.case
 // - src/dynamic-import/catch/nested-async-function-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-eval-rqstd-abrupt-urierror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-eval-rqstd-abrupt-urierror.js
index d6aa8e5f78e0..9f2da90d1bbc 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-eval-rqstd-abrupt-urierror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-eval-rqstd-abrupt-urierror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-urierror.case
 // - src/dynamic-import/catch/nested-async-function-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-eval-script-code-target.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-eval-script-code-target.js
index 6b06228ff167..df172276091c 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-eval-script-code-target.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-eval-script-code-target.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-target.case
 // - src/dynamic-import/catch/nested-async-function-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-file-does-not-exist.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-file-does-not-exist.js
index 9ed17fc2f283..cb15d43f4eea 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-file-does-not-exist.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-file-does-not-exist.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/file-does-not-exist.case
 // - src/dynamic-import/catch/nested-async-function-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-instn-iee-err-ambiguous-import.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-instn-iee-err-ambiguous-import.js
index 78d6aecf84e3..bf3e88212908 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-instn-iee-err-ambiguous-import.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-instn-iee-err-ambiguous-import.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-ambiguous-import.case
 // - src/dynamic-import/catch/nested-async-function-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-instn-iee-err-circular.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-instn-iee-err-circular.js
index c50b30d53922..f3e1f243cdae 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-instn-iee-err-circular.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-instn-iee-err-circular.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-circular.case
 // - src/dynamic-import/catch/nested-async-function-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-specifier-tostring-abrupt-rejects.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-specifier-tostring-abrupt-rejects.js
index f3ec1bfb54be..345b4f8afca8 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-specifier-tostring-abrupt-rejects.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-return-await-specifier-tostring-abrupt-rejects.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring-abrupt-rejects.case
 // - src/dynamic-import/catch/nested-async-function-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-specifier-tostring-abrupt-rejects.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-specifier-tostring-abrupt-rejects.js
index 70e3352eb050..c39c8a7360cb 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-specifier-tostring-abrupt-rejects.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-function-specifier-tostring-abrupt-rejects.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring-abrupt-rejects.case
 // - src/dynamic-import/catch/nested-async-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-eval-rqstd-abrupt-typeerror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-eval-rqstd-abrupt-typeerror.js
index eca64bb0fbbc..93cc1a4e4c9f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-eval-rqstd-abrupt-typeerror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-eval-rqstd-abrupt-typeerror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-typeerror.case
 // - src/dynamic-import/catch/nested-async-generator-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-eval-rqstd-abrupt-urierror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-eval-rqstd-abrupt-urierror.js
index 5955e4f28c8f..39df054ca6ea 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-eval-rqstd-abrupt-urierror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-eval-rqstd-abrupt-urierror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-urierror.case
 // - src/dynamic-import/catch/nested-async-generator-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-eval-script-code-target.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-eval-script-code-target.js
index 3dc5b288c430..9a55e57e81bc 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-eval-script-code-target.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-eval-script-code-target.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-target.case
 // - src/dynamic-import/catch/nested-async-generator-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-file-does-not-exist.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-file-does-not-exist.js
index 07fb2ca3cbb6..bbc36cbb004a 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-file-does-not-exist.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-file-does-not-exist.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/file-does-not-exist.case
 // - src/dynamic-import/catch/nested-async-generator-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-instn-iee-err-ambiguous-import.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-instn-iee-err-ambiguous-import.js
index 75e04b0c28f0..32c4365683cd 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-instn-iee-err-ambiguous-import.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-instn-iee-err-ambiguous-import.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-ambiguous-import.case
 // - src/dynamic-import/catch/nested-async-generator-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-instn-iee-err-circular.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-instn-iee-err-circular.js
index a47d46a3044b..98ea99df2330 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-instn-iee-err-circular.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-instn-iee-err-circular.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-circular.case
 // - src/dynamic-import/catch/nested-async-generator-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-specifier-tostring-abrupt-rejects.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-specifier-tostring-abrupt-rejects.js
index 7fa0854b460b..adbba9b41282 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-specifier-tostring-abrupt-rejects.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-await-specifier-tostring-abrupt-rejects.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring-abrupt-rejects.case
 // - src/dynamic-import/catch/nested-async-generator-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-eval-rqstd-abrupt-typeerror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-eval-rqstd-abrupt-typeerror.js
index 0423f0166bc2..579d6ae7bbe0 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-eval-rqstd-abrupt-typeerror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-eval-rqstd-abrupt-typeerror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-typeerror.case
 // - src/dynamic-import/catch/nested-async-generator-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-eval-rqstd-abrupt-urierror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-eval-rqstd-abrupt-urierror.js
index 74a3e4245c15..1cfedd735fa1 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-eval-rqstd-abrupt-urierror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-eval-rqstd-abrupt-urierror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-urierror.case
 // - src/dynamic-import/catch/nested-async-generator-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-eval-script-code-target.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-eval-script-code-target.js
index 88aecb802597..e10884640c1a 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-eval-script-code-target.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-eval-script-code-target.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-target.case
 // - src/dynamic-import/catch/nested-async-generator-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-file-does-not-exist.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-file-does-not-exist.js
index 60464771336f..3e030e3a2929 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-file-does-not-exist.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-file-does-not-exist.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/file-does-not-exist.case
 // - src/dynamic-import/catch/nested-async-generator-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-instn-iee-err-ambiguous-import.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-instn-iee-err-ambiguous-import.js
index c8253b80ff4c..fe8989b90290 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-instn-iee-err-ambiguous-import.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-instn-iee-err-ambiguous-import.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-ambiguous-import.case
 // - src/dynamic-import/catch/nested-async-generator-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-instn-iee-err-circular.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-instn-iee-err-circular.js
index d02eb9061470..0172a56c1ee2 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-instn-iee-err-circular.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-instn-iee-err-circular.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-circular.case
 // - src/dynamic-import/catch/nested-async-generator-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-specifier-tostring-abrupt-rejects.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-specifier-tostring-abrupt-rejects.js
index ac42b6377ae0..c5e0bd0c8c0d 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-specifier-tostring-abrupt-rejects.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-async-gen-return-await-specifier-tostring-abrupt-rejects.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring-abrupt-rejects.case
 // - src/dynamic-import/catch/nested-async-generator-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-eval-rqstd-abrupt-typeerror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-eval-rqstd-abrupt-typeerror.js
index b95c6ef39db9..29094af5c7e2 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-eval-rqstd-abrupt-typeerror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-eval-rqstd-abrupt-typeerror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-typeerror.case
 // - src/dynamic-import/catch/nested-block.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-eval-rqstd-abrupt-urierror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-eval-rqstd-abrupt-urierror.js
index e3940ea7ef58..aeb2fa5093cd 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-eval-rqstd-abrupt-urierror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-eval-rqstd-abrupt-urierror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-urierror.case
 // - src/dynamic-import/catch/nested-block.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-eval-script-code-target.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-eval-script-code-target.js
index ac40fa16bbf8..231a2325c527 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-eval-script-code-target.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-eval-script-code-target.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-target.case
 // - src/dynamic-import/catch/nested-block.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-file-does-not-exist.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-file-does-not-exist.js
index b15eca60ac06..2561377c6a38 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-file-does-not-exist.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-file-does-not-exist.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/file-does-not-exist.case
 // - src/dynamic-import/catch/nested-block.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-instn-iee-err-ambiguous-import.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-instn-iee-err-ambiguous-import.js
index 0d3c9e118381..76a2d3baa903 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-instn-iee-err-ambiguous-import.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-instn-iee-err-ambiguous-import.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-ambiguous-import.case
 // - src/dynamic-import/catch/nested-block.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-instn-iee-err-circular.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-instn-iee-err-circular.js
index ecfea070dcc3..86021f3f8e98 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-instn-iee-err-circular.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-instn-iee-err-circular.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-circular.case
 // - src/dynamic-import/catch/nested-block.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-specifier-tostring-abrupt-rejects.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-specifier-tostring-abrupt-rejects.js
index 4a6398c76813..95808af4056a 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-specifier-tostring-abrupt-rejects.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-import-catch-specifier-tostring-abrupt-rejects.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring-abrupt-rejects.case
 // - src/dynamic-import/catch/nested-block.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-eval-rqstd-abrupt-typeerror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-eval-rqstd-abrupt-typeerror.js
index f683c024c10f..dbf325aa3264 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-eval-rqstd-abrupt-typeerror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-eval-rqstd-abrupt-typeerror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-typeerror.case
 // - src/dynamic-import/catch/nested-block-labeled.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-eval-rqstd-abrupt-urierror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-eval-rqstd-abrupt-urierror.js
index 52587bd07a9b..a1712ea856fb 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-eval-rqstd-abrupt-urierror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-eval-rqstd-abrupt-urierror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-urierror.case
 // - src/dynamic-import/catch/nested-block-labeled.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-eval-script-code-target.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-eval-script-code-target.js
index 88d1fb004a43..b9c8c5ae115f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-eval-script-code-target.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-eval-script-code-target.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-target.case
 // - src/dynamic-import/catch/nested-block-labeled.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-file-does-not-exist.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-file-does-not-exist.js
index b111ce36c005..6194882a0cc8 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-file-does-not-exist.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-file-does-not-exist.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/file-does-not-exist.case
 // - src/dynamic-import/catch/nested-block-labeled.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-instn-iee-err-ambiguous-import.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-instn-iee-err-ambiguous-import.js
index f48138ea8b0b..4b8db96289eb 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-instn-iee-err-ambiguous-import.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-instn-iee-err-ambiguous-import.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-ambiguous-import.case
 // - src/dynamic-import/catch/nested-block-labeled.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-instn-iee-err-circular.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-instn-iee-err-circular.js
index 81fc211d7c98..8094fd96fac6 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-instn-iee-err-circular.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-instn-iee-err-circular.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-circular.case
 // - src/dynamic-import/catch/nested-block-labeled.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-specifier-tostring-abrupt-rejects.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-specifier-tostring-abrupt-rejects.js
index b6723a7059f8..18f97d84281a 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-specifier-tostring-abrupt-rejects.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-block-labeled-specifier-tostring-abrupt-rejects.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring-abrupt-rejects.case
 // - src/dynamic-import/catch/nested-block-labeled.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-eval-rqstd-abrupt-typeerror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-eval-rqstd-abrupt-typeerror.js
index 18f0599a6a55..e05d180c1e8c 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-eval-rqstd-abrupt-typeerror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-eval-rqstd-abrupt-typeerror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-typeerror.case
 // - src/dynamic-import/catch/nested-do-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-eval-rqstd-abrupt-urierror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-eval-rqstd-abrupt-urierror.js
index 6e42f6d2ba89..e3d5a994847b 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-eval-rqstd-abrupt-urierror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-eval-rqstd-abrupt-urierror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-urierror.case
 // - src/dynamic-import/catch/nested-do-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-eval-script-code-target.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-eval-script-code-target.js
index 3d0cbcae6b0a..717e8779a755 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-eval-script-code-target.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-eval-script-code-target.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-target.case
 // - src/dynamic-import/catch/nested-do-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-file-does-not-exist.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-file-does-not-exist.js
index 7dd7497a8ac7..1259eb36b6b6 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-file-does-not-exist.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-file-does-not-exist.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/file-does-not-exist.case
 // - src/dynamic-import/catch/nested-do-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-instn-iee-err-ambiguous-import.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-instn-iee-err-ambiguous-import.js
index 31f8cad6edeb..3054b33ab7ae 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-instn-iee-err-ambiguous-import.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-instn-iee-err-ambiguous-import.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-ambiguous-import.case
 // - src/dynamic-import/catch/nested-do-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-instn-iee-err-circular.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-instn-iee-err-circular.js
index 84f892662449..f427d8e053f0 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-instn-iee-err-circular.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-instn-iee-err-circular.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-circular.case
 // - src/dynamic-import/catch/nested-do-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-specifier-tostring-abrupt-rejects.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-specifier-tostring-abrupt-rejects.js
index 7525280a08ee..87573140b141 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-specifier-tostring-abrupt-rejects.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-do-while-specifier-tostring-abrupt-rejects.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring-abrupt-rejects.case
 // - src/dynamic-import/catch/nested-do-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-eval-rqstd-abrupt-typeerror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-eval-rqstd-abrupt-typeerror.js
index 8932da53347e..05a26f34bf8d 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-eval-rqstd-abrupt-typeerror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-eval-rqstd-abrupt-typeerror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-typeerror.case
 // - src/dynamic-import/catch/nested-else.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-eval-rqstd-abrupt-urierror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-eval-rqstd-abrupt-urierror.js
index 94389102dfb3..291d08672552 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-eval-rqstd-abrupt-urierror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-eval-rqstd-abrupt-urierror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-urierror.case
 // - src/dynamic-import/catch/nested-else.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-eval-script-code-target.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-eval-script-code-target.js
index 4531211ccb30..d226fe2d727b 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-eval-script-code-target.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-eval-script-code-target.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-target.case
 // - src/dynamic-import/catch/nested-else.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-file-does-not-exist.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-file-does-not-exist.js
index 089f06a196a7..26e79c7a7548 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-file-does-not-exist.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-file-does-not-exist.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/file-does-not-exist.case
 // - src/dynamic-import/catch/nested-else.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-instn-iee-err-ambiguous-import.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-instn-iee-err-ambiguous-import.js
index 669261a50189..5eaf8a76166d 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-instn-iee-err-ambiguous-import.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-instn-iee-err-ambiguous-import.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-ambiguous-import.case
 // - src/dynamic-import/catch/nested-else.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-instn-iee-err-circular.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-instn-iee-err-circular.js
index 5027242a8856..d918c10c0adc 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-instn-iee-err-circular.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-instn-iee-err-circular.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-circular.case
 // - src/dynamic-import/catch/nested-else.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-specifier-tostring-abrupt-rejects.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-specifier-tostring-abrupt-rejects.js
index 6d8e0223ba85..062b601c1da1 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-specifier-tostring-abrupt-rejects.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-else-import-catch-specifier-tostring-abrupt-rejects.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring-abrupt-rejects.case
 // - src/dynamic-import/catch/nested-else.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-eval-rqstd-abrupt-typeerror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-eval-rqstd-abrupt-typeerror.js
index b54ced6c002b..7dddd78a655c 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-eval-rqstd-abrupt-typeerror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-eval-rqstd-abrupt-typeerror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-typeerror.case
 // - src/dynamic-import/catch/nested-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-eval-rqstd-abrupt-urierror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-eval-rqstd-abrupt-urierror.js
index 1b6661ea712b..12da5e0fee12 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-eval-rqstd-abrupt-urierror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-eval-rqstd-abrupt-urierror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-urierror.case
 // - src/dynamic-import/catch/nested-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-eval-script-code-target.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-eval-script-code-target.js
index 909882215ed8..b6466d3984f0 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-eval-script-code-target.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-eval-script-code-target.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-target.case
 // - src/dynamic-import/catch/nested-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-file-does-not-exist.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-file-does-not-exist.js
index ba5f1660af7f..6617b30c070a 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-file-does-not-exist.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-file-does-not-exist.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/file-does-not-exist.case
 // - src/dynamic-import/catch/nested-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-instn-iee-err-ambiguous-import.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-instn-iee-err-ambiguous-import.js
index fc8e6e03d683..11933bf00a18 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-instn-iee-err-ambiguous-import.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-instn-iee-err-ambiguous-import.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-ambiguous-import.case
 // - src/dynamic-import/catch/nested-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-instn-iee-err-circular.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-instn-iee-err-circular.js
index 3fbd7840933a..e82842c327ff 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-instn-iee-err-circular.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-instn-iee-err-circular.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-circular.case
 // - src/dynamic-import/catch/nested-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-specifier-tostring-abrupt-rejects.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-specifier-tostring-abrupt-rejects.js
index 1917a05566fd..88f0a414d719 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-specifier-tostring-abrupt-rejects.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-function-import-catch-specifier-tostring-abrupt-rejects.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring-abrupt-rejects.case
 // - src/dynamic-import/catch/nested-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-eval-rqstd-abrupt-typeerror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-eval-rqstd-abrupt-typeerror.js
index b7a79ce84901..ed34211ef91a 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-eval-rqstd-abrupt-typeerror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-eval-rqstd-abrupt-typeerror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-typeerror.case
 // - src/dynamic-import/catch/nested-if.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-eval-rqstd-abrupt-urierror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-eval-rqstd-abrupt-urierror.js
index 49cb759b7c7a..0ec287976e11 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-eval-rqstd-abrupt-urierror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-eval-rqstd-abrupt-urierror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-urierror.case
 // - src/dynamic-import/catch/nested-if.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-eval-script-code-target.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-eval-script-code-target.js
index 2d55d7a97b6c..56120f141911 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-eval-script-code-target.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-eval-script-code-target.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-target.case
 // - src/dynamic-import/catch/nested-if.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-file-does-not-exist.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-file-does-not-exist.js
index 623ae7166236..0d80b9c1952b 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-file-does-not-exist.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-file-does-not-exist.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/file-does-not-exist.case
 // - src/dynamic-import/catch/nested-if.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-instn-iee-err-ambiguous-import.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-instn-iee-err-ambiguous-import.js
index 3a382d521e9e..21e6f4f1047e 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-instn-iee-err-ambiguous-import.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-instn-iee-err-ambiguous-import.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-ambiguous-import.case
 // - src/dynamic-import/catch/nested-if.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-instn-iee-err-circular.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-instn-iee-err-circular.js
index fdc419257fbe..2659577379ad 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-instn-iee-err-circular.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-instn-iee-err-circular.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-circular.case
 // - src/dynamic-import/catch/nested-if.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-specifier-tostring-abrupt-rejects.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-specifier-tostring-abrupt-rejects.js
index eca30e05e09c..3a3876988f72 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-specifier-tostring-abrupt-rejects.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-if-import-catch-specifier-tostring-abrupt-rejects.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring-abrupt-rejects.case
 // - src/dynamic-import/catch/nested-if.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-eval-rqstd-abrupt-typeerror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-eval-rqstd-abrupt-typeerror.js
index 0fd5bc9c7856..aeea269589c9 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-eval-rqstd-abrupt-typeerror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-eval-rqstd-abrupt-typeerror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-typeerror.case
 // - src/dynamic-import/catch/nested-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-eval-rqstd-abrupt-urierror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-eval-rqstd-abrupt-urierror.js
index 87efb2aef4dd..028e0848a75d 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-eval-rqstd-abrupt-urierror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-eval-rqstd-abrupt-urierror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-urierror.case
 // - src/dynamic-import/catch/nested-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-eval-script-code-target.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-eval-script-code-target.js
index a1786d096ca5..9a0cceea8848 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-eval-script-code-target.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-eval-script-code-target.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-target.case
 // - src/dynamic-import/catch/nested-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-file-does-not-exist.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-file-does-not-exist.js
index 671238e7c353..d86b3c6719ab 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-file-does-not-exist.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-file-does-not-exist.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/file-does-not-exist.case
 // - src/dynamic-import/catch/nested-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-instn-iee-err-ambiguous-import.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-instn-iee-err-ambiguous-import.js
index 3cf222c669f9..589b105cb2a5 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-instn-iee-err-ambiguous-import.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-instn-iee-err-ambiguous-import.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-ambiguous-import.case
 // - src/dynamic-import/catch/nested-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-instn-iee-err-circular.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-instn-iee-err-circular.js
index d40425dcd4cc..51b414da1731 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-instn-iee-err-circular.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-instn-iee-err-circular.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-circular.case
 // - src/dynamic-import/catch/nested-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-specifier-tostring-abrupt-rejects.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-specifier-tostring-abrupt-rejects.js
index ddf0987e06e2..7d574e6d3bbc 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-specifier-tostring-abrupt-rejects.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/nested-while-import-catch-specifier-tostring-abrupt-rejects.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring-abrupt-rejects.case
 // - src/dynamic-import/catch/nested-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-eval-rqstd-abrupt-typeerror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-eval-rqstd-abrupt-typeerror.js
index e3202fa54991..e888bab4f16e 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-eval-rqstd-abrupt-typeerror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-eval-rqstd-abrupt-typeerror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-typeerror.case
 // - src/dynamic-import/catch/top-level.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-eval-rqstd-abrupt-urierror.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-eval-rqstd-abrupt-urierror.js
index e67df2a4c248..023a4b7a900f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-eval-rqstd-abrupt-urierror.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-eval-rqstd-abrupt-urierror.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-rqstd-abrupt-urierror.case
 // - src/dynamic-import/catch/top-level.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-eval-script-code-target.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-eval-script-code-target.js
index 5c7f4784222d..e51e55d13a59 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-eval-script-code-target.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-eval-script-code-target.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-target.case
 // - src/dynamic-import/catch/top-level.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-file-does-not-exist.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-file-does-not-exist.js
index cbf8c6913221..285309be8cfa 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-file-does-not-exist.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-file-does-not-exist.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/file-does-not-exist.case
 // - src/dynamic-import/catch/top-level.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-instn-iee-err-ambiguous-import.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-instn-iee-err-ambiguous-import.js
index 3231dd225e28..f90d82e6da05 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-instn-iee-err-ambiguous-import.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-instn-iee-err-ambiguous-import.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-ambiguous-import.case
 // - src/dynamic-import/catch/top-level.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-instn-iee-err-circular.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-instn-iee-err-circular.js
index f49b06629f66..c2097764c71b 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-instn-iee-err-circular.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-instn-iee-err-circular.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/instn-iee-err-circular.case
 // - src/dynamic-import/catch/top-level.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-specifier-tostring-abrupt-rejects.js b/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-specifier-tostring-abrupt-rejects.js
index 02ecae37f56e..1093d73e2b79 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-specifier-tostring-abrupt-rejects.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/catch/top-level-import-catch-specifier-tostring-abrupt-rejects.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring-abrupt-rejects.case
 // - src/dynamic-import/catch/top-level.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/custom-primitive.js b/js/src/tests/test262/language/expressions/dynamic-import/custom-primitive.js
index eee1707be534..9213c7901a25 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/custom-primitive.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/custom-primitive.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/double-error-resolution-promise.js b/js/src/tests/test262/language/expressions/dynamic-import/double-error-resolution-promise.js
index a03a7019dea5..63e0d022666c 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/double-error-resolution-promise.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/double-error-resolution-promise.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/double-error-resolution.js b/js/src/tests/test262/language/expressions/dynamic-import/double-error-resolution.js
index 41d830af99dc..490d3f76abcb 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/double-error-resolution.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/double-error-resolution.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/escape-sequence-import.js b/js/src/tests/test262/language/expressions/dynamic-import/escape-sequence-import.js
index 3da99e7abc03..c7482e46fc7d 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/escape-sequence-import.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/escape-sequence-import.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 André Bargull. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-cls-anon.js b/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-cls-anon.js
index 3a2d3a1448f4..d278c96c4ce8 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-cls-anon.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-cls-anon.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Rick Waldron. All rights reserved.
 // Copyright (C) 2016 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-cls-name-meth.js b/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-cls-name-meth.js
index e121f3478860..e258eb82705c 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-cls-name-meth.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-cls-name-meth.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Rick Waldron. All rights reserved.
 // Copyright (C) 2016 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-cls-named.js b/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-cls-named.js
index 9c547b409cf0..7842cf070f11 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-cls-named.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-cls-named.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Rick Waldron. All rights reserved.
 // Copyright (C) 2016 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-cls-anon.js b/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-cls-anon.js
index ce89f1856597..367fe925e4ad 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-cls-anon.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-cls-anon.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Rick Waldron. All rights reserved.
 // Copyright (C) 2016 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-cls-name-meth.js b/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-cls-name-meth.js
index 3d9d6e7a541d..027b379dc0e9 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-cls-name-meth.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-cls-name-meth.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Rick Waldron. All rights reserved.
 // Copyright (C) 2016 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-cls-named.js b/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-cls-named.js
index 5f8fbe6f6638..638dae77e64a 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-cls-named.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-cls-named.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Rick Waldron. All rights reserved.
 // Copyright (C) 2016 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-fn-anon.js b/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-fn-anon.js
index 7e4f9be71dad..2ae26e72a781 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-fn-anon.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-fn-anon.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Rick Waldron. All rights reserved.
 // Copyright (C) 2016 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-fn-named.js b/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-fn-named.js
index 68c49ffab708..bf515e203b28 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-fn-named.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-fn-named.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Rick Waldron. All rights reserved.
 // Copyright (C) 2016 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-gen-anon.js b/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-gen-anon.js
index e7e2215c7dac..0c7e9a314f41 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-gen-anon.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-gen-anon.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Rick Waldron. All rights reserved.
 // Copyright (C) 2016 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-gen-named.js b/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-gen-named.js
index f8dc03785e6c..e651d1ff14b7 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-gen-named.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-gen-named.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Rick Waldron. All rights reserved.
 // Copyright (C) 2016 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-in.js b/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-in.js
index c22293e6fa42..b84067e6e5c7 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-in.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/eval-export-dflt-expr-in.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Rick Waldron. All rights reserved.
 // Copyright (C) 2016 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/eval-rqstd-once.js b/js/src/tests/test262/language/expressions/dynamic-import/eval-rqstd-once.js
index 997f71a96145..0b99c3085db2 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/eval-rqstd-once.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/eval-rqstd-once.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Rick Waldron. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/eval-self-once-module.js b/js/src/tests/test262/language/expressions/dynamic-import/eval-self-once-module.js
index 75234619a575..4762b7d2cca8 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/eval-self-once-module.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/eval-self-once-module.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Rick Waldron. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/eval-self-once-script.js b/js/src/tests/test262/language/expressions/dynamic-import/eval-self-once-script.js
index b00a79195fe3..3868cb26da5a 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/eval-self-once-script.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/eval-self-once-script.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Rick Waldron. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/for-await-resolution-and-error-agen-yield.js b/js/src/tests/test262/language/expressions/dynamic-import/for-await-resolution-and-error-agen-yield.js
index cc6f1fce6874..0cd96d379754 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/for-await-resolution-and-error-agen-yield.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/for-await-resolution-and-error-agen-yield.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/for-await-resolution-and-error-agen.js b/js/src/tests/test262/language/expressions/dynamic-import/for-await-resolution-and-error-agen.js
index ca393f5b8a69..5ad995ab1eba 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/for-await-resolution-and-error-agen.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/for-await-resolution-and-error-agen.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/for-await-resolution-and-error.js b/js/src/tests/test262/language/expressions/dynamic-import/for-await-resolution-and-error.js
index ffbeaf4554eb..cc2c69726a4f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/for-await-resolution-and-error.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/for-await-resolution-and-error.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/imported-self-update.js b/js/src/tests/test262/language/expressions/dynamic-import/imported-self-update.js
index 07580329a4b7..12c04a54d15b 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/imported-self-update.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/imported-self-update.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/indirect-resolution-1_FIXTURE.js b/js/src/tests/test262/language/expressions/dynamic-import/indirect-resolution-1_FIXTURE.js
index d444979caa92..d726daed93a9 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/indirect-resolution-1_FIXTURE.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/indirect-resolution-1_FIXTURE.js
@@ -2,4 +2,4 @@
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
-export default import('./indirect-resolution-2_FIXTURE.js');
+export default import('indirect-resolution-2_FIXTURE.js');
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/indirect-resolution.js b/js/src/tests/test262/language/expressions/dynamic-import/indirect-resolution.js
index e1b01a7497b1..e0f49e95e3b2 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/indirect-resolution.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/indirect-resolution.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-Symbol-toStringTag.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-Symbol-toStringTag.js
index 585a039ab067..095f9d8fde43 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-Symbol-toStringTag.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-Symbol-toStringTag.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-Symbol-toStringTag.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-define-own-property.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-define-own-property.js
index 62f67ee2ee04..220bf553034b 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-define-own-property.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-define-own-property.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-define-own-property.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-delete-exported-init-no-strict.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-delete-exported-init-no-strict.js
index 3daa25f30e87..c45a6e8a58dc 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-delete-exported-init-no-strict.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-delete-exported-init-no-strict.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-delete-exported-init-no-strict.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-delete-exported-init-strict-strict.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-delete-exported-init-strict-strict.js
index b06f4e6f556c..336c48db5b86 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-delete-exported-init-strict-strict.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-delete-exported-init-strict-strict.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 'use strict';
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-delete-exported-init-strict.case
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-delete-non-exported-no-strict.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-delete-non-exported-no-strict.js
index c695bbfff2f8..067714b54080 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-delete-non-exported-no-strict.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-delete-non-exported-no-strict.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-delete-non-exported-no-strict.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-delete-non-exported-strict-strict.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-delete-non-exported-strict-strict.js
index 24ce12efe8eb..05809ec1f8cf 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-delete-non-exported-strict-strict.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-delete-non-exported-strict-strict.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 'use strict';
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-delete-non-exported-strict.case
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-extensible.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-extensible.js
index e35aa7418fa8..c15e8a4cc4d0 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-extensible.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-extensible.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-extensible.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-own-property-str-found-init.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-own-property-str-found-init.js
index 0577d03135b1..d08c08dc7919 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-own-property-str-found-init.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-own-property-str-found-init.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-get-own-property-str-found-init.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-own-property-str-not-found.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-own-property-str-not-found.js
index abf689fcfe32..29987884d82f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-own-property-str-not-found.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-own-property-str-not-found.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-get-own-property-str-not-found.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-own-property-sym.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-own-property-sym.js
index 318788e28b20..c601b97b1f66 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-own-property-sym.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-own-property-sym.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-get-own-property-sym.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-str-found.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-str-found.js
index 0a971a694442..ff5d63c56a90 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-str-found.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-str-found.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-get-str-found.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-str-not-found.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-str-not-found.js
index 4c15994aee17..6296fb372993 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-str-not-found.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-str-not-found.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-get-str-not-found.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-sym-found.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-sym-found.js
index da8c6c2797ed..64c1b3b91466 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-sym-found.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-sym-found.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-get-sym-found.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-sym-not-found.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-sym-not-found.js
index 3366101da4e9..e2e0adf5c92a 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-sym-not-found.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-get-sym-not-found.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-get-sym-not-found.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-has-property-str-found-init.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-has-property-str-found-init.js
index 7e12f8b083e5..244574e6b456 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-has-property-str-found-init.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-has-property-str-found-init.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-has-property-str-found-init.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-has-property-str-not-found.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-has-property-str-not-found.js
index 7d241a47a013..c3eeae363e7b 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-has-property-str-not-found.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-has-property-str-not-found.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-has-property-str-not-found.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-has-property-sym-found.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-has-property-sym-found.js
index 1e68c121ca33..054100b0b86f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-has-property-sym-found.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-has-property-sym-found.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-has-property-sym-found.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-has-property-sym-not-found.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-has-property-sym-not-found.js
index fddf13b98572..c294df0b89ce 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-has-property-sym-not-found.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-has-property-sym-not-found.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-has-property-sym-not-found.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-no-iterator.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-no-iterator.js
index fe17ef298be5..606c6a483c41 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-no-iterator.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-no-iterator.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-no-iterator.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-own-property-keys-sort.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-own-property-keys-sort.js
index b4487e09d170..b49c90a859ca 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-own-property-keys-sort.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-own-property-keys-sort.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-own-property-keys-sort.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-prevent-extensions-object.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-prevent-extensions-object.js
index 7fc2708a5d99..2fbeceb9e74f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-prevent-extensions-object.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-prevent-extensions-object.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-prevent-extensions-object.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-prevent-extensions-reflect.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-prevent-extensions-reflect.js
index 28edbf8fca9e..982b9b30385f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-prevent-extensions-reflect.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-prevent-extensions-reflect.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-prevent-extensions-reflect.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-prop-descs.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-prop-descs.js
index 99362a928294..bc7a69d197d8 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-prop-descs.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-prop-descs.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-prop-descs.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-prototype.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-prototype.js
index c21c6b84fbe5..fd44f3ade908 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-prototype.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-prototype.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-prototype.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-no-strict.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-no-strict.js
index 858c0275bae8..fd9bc66fbd04 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-no-strict.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-no-strict.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-set-no-strict.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-prototype-of-null.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-prototype-of-null.js
index 02a75f470a9d..d4c6ee06e49f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-prototype-of-null.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-prototype-of-null.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-set-prototype-of-null.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-prototype-of.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-prototype-of.js
index 819f8429cdd9..4293346f0a77 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-prototype-of.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-prototype-of.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-set-prototype-of.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-same-values-no-strict.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-same-values-no-strict.js
index e5e636b0c9b5..e2d26f7ee1fa 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-same-values-no-strict.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-same-values-no-strict.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-set-same-values-no-strict.case
 // - src/dynamic-import/namespace/await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-same-values-strict-strict.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-same-values-strict-strict.js
index 1a4a85a475e8..9b51c8cd2325 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-same-values-strict-strict.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-same-values-strict-strict.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 'use strict';
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-set-same-values-strict.case
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-strict-strict.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-strict-strict.js
index 9dc4b281086c..8122dd268558 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-strict-strict.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/await-ns-set-strict-strict.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 'use strict';
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-set-strict.case
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/default-property-not-set-own.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/default-property-not-set-own.js
index db527cd2f679..f462ee23beb1 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/default-property-not-set-own.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/default-property-not-set-own.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
@@ -26,7 +27,7 @@ info: |
         5. Return namespace.
 ---*/
 
-import('./empty_FIXTURE.js').then(ns => {
+import('./default-property-not-set-own.js').then(ns => {
 
     assert.sameValue(Object.prototype.hasOwnProperty.call(ns, 'default'), false);
 
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-Symbol-toStringTag.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-Symbol-toStringTag.js
index bb0e5f68d8d4..0ca5036c3cfd 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-Symbol-toStringTag.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-Symbol-toStringTag.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-Symbol-toStringTag.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-define-own-property.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-define-own-property.js
index e746ede5a8f9..e68c399114b3 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-define-own-property.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-define-own-property.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-define-own-property.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-delete-exported-init-no-strict.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-delete-exported-init-no-strict.js
index 39847dde7545..dbad37b9730a 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-delete-exported-init-no-strict.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-delete-exported-init-no-strict.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-delete-exported-init-no-strict.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-delete-exported-init-strict-strict.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-delete-exported-init-strict-strict.js
index c9a3589ee9f4..774f732a4ed2 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-delete-exported-init-strict-strict.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-delete-exported-init-strict-strict.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 'use strict';
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-delete-exported-init-strict.case
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-delete-non-exported-no-strict.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-delete-non-exported-no-strict.js
index 88b707c8d00e..b2e03959c8fd 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-delete-non-exported-no-strict.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-delete-non-exported-no-strict.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-delete-non-exported-no-strict.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-delete-non-exported-strict-strict.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-delete-non-exported-strict-strict.js
index a856e0f98275..6dff1e60c05f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-delete-non-exported-strict-strict.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-delete-non-exported-strict-strict.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 'use strict';
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-delete-non-exported-strict.case
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-extensible.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-extensible.js
index 28a628d21178..c78f36583bc8 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-extensible.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-extensible.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-extensible.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-own-property-str-found-init.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-own-property-str-found-init.js
index 5652eef1194a..ab67d9a615f3 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-own-property-str-found-init.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-own-property-str-found-init.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-get-own-property-str-found-init.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-own-property-str-not-found.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-own-property-str-not-found.js
index 7e3e40c2d81e..bfa2c0eebc56 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-own-property-str-not-found.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-own-property-str-not-found.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-get-own-property-str-not-found.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-own-property-sym.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-own-property-sym.js
index 6824a10f98a8..32757bc5758a 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-own-property-sym.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-own-property-sym.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-get-own-property-sym.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-str-found.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-str-found.js
index 7322efc54129..235fe0a1616a 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-str-found.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-str-found.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-get-str-found.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-str-not-found.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-str-not-found.js
index bae537b0d58f..62a63ea1e87d 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-str-not-found.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-str-not-found.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-get-str-not-found.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-sym-found.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-sym-found.js
index f2f4e20cfb4c..50555d6bbd60 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-sym-found.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-sym-found.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-get-sym-found.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-sym-not-found.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-sym-not-found.js
index d34090ff6b64..6e462dc27af1 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-sym-not-found.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-get-sym-not-found.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-get-sym-not-found.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-has-property-str-found-init.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-has-property-str-found-init.js
index b142bc0aff51..db09e7abca31 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-has-property-str-found-init.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-has-property-str-found-init.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-has-property-str-found-init.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-has-property-str-not-found.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-has-property-str-not-found.js
index acaef1dd025b..4daa7df76e5d 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-has-property-str-not-found.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-has-property-str-not-found.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-has-property-str-not-found.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-has-property-sym-found.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-has-property-sym-found.js
index 890a6127b1ce..f031255b5c42 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-has-property-sym-found.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-has-property-sym-found.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-has-property-sym-found.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-has-property-sym-not-found.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-has-property-sym-not-found.js
index d737f6a66b0c..bfc68e2bd8b1 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-has-property-sym-not-found.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-has-property-sym-not-found.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-has-property-sym-not-found.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-no-iterator.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-no-iterator.js
index d8e507273bf7..f9fe659a285e 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-no-iterator.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-no-iterator.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-no-iterator.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-own-property-keys-sort.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-own-property-keys-sort.js
index d773959f10e0..eabd25f84378 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-own-property-keys-sort.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-own-property-keys-sort.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-own-property-keys-sort.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-prevent-extensions-object.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-prevent-extensions-object.js
index 021035331217..e9d29470ca3b 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-prevent-extensions-object.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-prevent-extensions-object.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-prevent-extensions-object.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-prevent-extensions-reflect.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-prevent-extensions-reflect.js
index 8860abb4a3e0..effbec094e70 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-prevent-extensions-reflect.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-prevent-extensions-reflect.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-prevent-extensions-reflect.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-prop-descs.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-prop-descs.js
index dbd285644d60..f2632b451b47 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-prop-descs.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-prop-descs.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-prop-descs.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-prototype.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-prototype.js
index 5af5a859d36f..8a00090ddbd5 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-prototype.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-prototype.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-prototype.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-no-strict.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-no-strict.js
index 759385ffed4f..014ca099b9a2 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-no-strict.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-no-strict.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-set-no-strict.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-prototype-of-null.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-prototype-of-null.js
index 95e9e8b15ae7..92c94a0f7008 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-prototype-of-null.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-prototype-of-null.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-set-prototype-of-null.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-prototype-of.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-prototype-of.js
index 9636c173e862..66e0ebd81b20 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-prototype-of.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-prototype-of.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-set-prototype-of.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-same-values-no-strict.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-same-values-no-strict.js
index 63d1246935c4..02d5792c73bc 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-same-values-no-strict.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-same-values-no-strict.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-set-same-values-no-strict.case
 // - src/dynamic-import/namespace/promise.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-same-values-strict-strict.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-same-values-strict-strict.js
index d3867bead56d..ee7a61d7566f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-same-values-strict-strict.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-same-values-strict-strict.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 'use strict';
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-set-same-values-strict.case
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-strict-strict.js b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-strict-strict.js
index f9969c342baa..0becee3c606d 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-strict-strict.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/namespace/promise-then-ns-set-strict-strict.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 'use strict';
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/ns-set-strict.case
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/returns-promise.js b/js/src/tests/test262/language/expressions/dynamic-import/returns-promise.js
index e184297af9e9..0f1b2be30ab5 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/returns-promise.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/returns-promise.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/reuse-namespace-object-from-import.js b/js/src/tests/test262/language/expressions/dynamic-import/reuse-namespace-object-from-import.js
index 9c494c16e7cc..4c85ecf1de12 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/reuse-namespace-object-from-import.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/reuse-namespace-object-from-import.js
@@ -1,4 +1,4 @@
-// |reftest| module
+// |reftest| skip-if(!xulRuntime.shell) module -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/reuse-namespace-object-from-script.js b/js/src/tests/test262/language/expressions/dynamic-import/reuse-namespace-object-from-script.js
index bf30e85fb2c2..a55e975d51ab 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/reuse-namespace-object-from-script.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/reuse-namespace-object-from-script.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/reuse-namespace-object.js b/js/src/tests/test262/language/expressions/dynamic-import/reuse-namespace-object.js
index 1abec9297bcc..9fbed1a226e7 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/reuse-namespace-object.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/reuse-namespace-object.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-1-update-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-1-update-expression.js
index 8c53468f5ba5..89926024dd9f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-1-update-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-1-update-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:ReferenceError
+// |reftest| skip-if(!xulRuntime.shell) error:ReferenceError -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-10-lhs-assignment-operator-assignment-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-10-lhs-assignment-operator-assignment-expression.js
index a2a4f363af9f..18f693bef600 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-10-lhs-assignment-operator-assignment-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-10-lhs-assignment-operator-assignment-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:ReferenceError
+// |reftest| skip-if(!xulRuntime.shell) error:ReferenceError -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-11-lhs-assignment-operator-assignment-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-11-lhs-assignment-operator-assignment-expression.js
index f974c499b754..c629cce29d5f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-11-lhs-assignment-operator-assignment-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-11-lhs-assignment-operator-assignment-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:ReferenceError
+// |reftest| skip-if(!xulRuntime.shell) error:ReferenceError -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-12-lhs-assignment-operator-assignment-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-12-lhs-assignment-operator-assignment-expression.js
index 25f863bb8606..fa444f618cab 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-12-lhs-assignment-operator-assignment-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-12-lhs-assignment-operator-assignment-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:ReferenceError
+// |reftest| skip-if(!xulRuntime.shell) error:ReferenceError -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-13-lhs-assignment-operator-assignment-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-13-lhs-assignment-operator-assignment-expression.js
index a221082b7ff4..a6ac6fac490c 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-13-lhs-assignment-operator-assignment-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-13-lhs-assignment-operator-assignment-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:ReferenceError
+// |reftest| skip-if(!xulRuntime.shell) error:ReferenceError -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-14-lhs-assignment-operator-assignment-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-14-lhs-assignment-operator-assignment-expression.js
index 7202b5d70404..43071af54f51 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-14-lhs-assignment-operator-assignment-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-14-lhs-assignment-operator-assignment-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:ReferenceError
+// |reftest| skip-if(!xulRuntime.shell) error:ReferenceError -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-15-lhs-assignment-operator-assignment-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-15-lhs-assignment-operator-assignment-expression.js
index 1015f8f27d76..694c063973b7 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-15-lhs-assignment-operator-assignment-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-15-lhs-assignment-operator-assignment-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:ReferenceError
+// |reftest| skip-if(!xulRuntime.shell) error:ReferenceError -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-16-lhs-assignment-operator-assignment-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-16-lhs-assignment-operator-assignment-expression.js
index ef1b522069f7..b81fa178edb0 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-16-lhs-assignment-operator-assignment-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-16-lhs-assignment-operator-assignment-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:ReferenceError
+// |reftest| skip-if(!xulRuntime.shell) error:ReferenceError -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-17-lhs-assignment-operator-assignment-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-17-lhs-assignment-operator-assignment-expression.js
index 3b862f1b5497..2c9a82896a4f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-17-lhs-assignment-operator-assignment-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-17-lhs-assignment-operator-assignment-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:ReferenceError
+// |reftest| skip-if(!xulRuntime.shell) error:ReferenceError -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-2-update-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-2-update-expression.js
index fdd9a5a3045a..84e1831cb176 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-2-update-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-2-update-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:ReferenceError
+// |reftest| skip-if(!xulRuntime.shell) error:ReferenceError -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-3-update-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-3-update-expression.js
index 36a18b59cb0a..8c3a7da4b9c1 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-3-update-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-3-update-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:ReferenceError
+// |reftest| skip-if(!xulRuntime.shell) error:ReferenceError -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-4-update-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-4-update-expression.js
index 9780f43a0a82..da91943588e2 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-4-update-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-4-update-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:ReferenceError
+// |reftest| skip-if(!xulRuntime.shell) error:ReferenceError -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-5-lhs-equals-assignment-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-5-lhs-equals-assignment-expression.js
index 211ea2bc1a8a..ed7db8288053 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-5-lhs-equals-assignment-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-5-lhs-equals-assignment-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:ReferenceError
+// |reftest| skip-if(!xulRuntime.shell) error:ReferenceError -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-6-lhs-assignment-operator-assignment-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-6-lhs-assignment-operator-assignment-expression.js
index b8823eac5ce7..7003182262c6 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-6-lhs-assignment-operator-assignment-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-6-lhs-assignment-operator-assignment-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:ReferenceError
+// |reftest| skip-if(!xulRuntime.shell) error:ReferenceError -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-7-lhs-assignment-operator-assignment-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-7-lhs-assignment-operator-assignment-expression.js
index b9a0b67d4ed8..41c5aa8c9405 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-7-lhs-assignment-operator-assignment-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-7-lhs-assignment-operator-assignment-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:ReferenceError
+// |reftest| skip-if(!xulRuntime.shell) error:ReferenceError -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-8-lhs-assignment-operator-assignment-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-8-lhs-assignment-operator-assignment-expression.js
index b1b87585b2d0..2033ca3817ca 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-8-lhs-assignment-operator-assignment-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-8-lhs-assignment-operator-assignment-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:ReferenceError
+// |reftest| skip-if(!xulRuntime.shell) error:ReferenceError -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-9-lhs-assignment-operator-assignment-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-9-lhs-assignment-operator-assignment-expression.js
index 5cfef73e3482..c8c9dccab1bf 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-9-lhs-assignment-operator-assignment-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/invalid-asssignmenttargettype-reference-error-9-lhs-assignment-operator-assignment-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:ReferenceError
+// |reftest| skip-if(!xulRuntime.shell) error:ReferenceError -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expr-not-optional.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expr-not-optional.js
index cb1acc4acbfd..7e5604aaad41 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expr-not-optional.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expr-not-optional.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/assignment-expr-not-optional.case
 // - src/dynamic-import/syntax/invalid/nested-arrow.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expression-assignment-expr-not-optional.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expression-assignment-expr-not-optional.js
index 23712cb4cf96..4401e8fa508f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expression-assignment-expr-not-optional.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expression-assignment-expr-not-optional.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/assignment-expr-not-optional.case
 // - src/dynamic-import/syntax/invalid/nested-arrow-assignment-expression.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expression-no-new-call-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expression-no-new-call-expression.js
index 7cd4d3e32478..f755a9aaf5d5 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expression-no-new-call-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expression-no-new-call-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-new-call-expression.case
 // - src/dynamic-import/syntax/invalid/nested-arrow-assignment-expression.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expression-no-rest-param.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expression-no-rest-param.js
index 8f04fe283d07..3d9742d2d322 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expression-no-rest-param.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expression-no-rest-param.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-rest-param.case
 // - src/dynamic-import/syntax/invalid/nested-arrow-assignment-expression.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expression-not-extensible-args.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expression-not-extensible-args.js
index d3a19069ac04..88b5175ded5e 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expression-not-extensible-args.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expression-not-extensible-args.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-args.case
 // - src/dynamic-import/syntax/invalid/nested-arrow-assignment-expression.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expression-not-extensible-no-trailing-comma.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expression-not-extensible-no-trailing-comma.js
index 7c901925a3b4..fc34c356335f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expression-not-extensible-no-trailing-comma.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-assignment-expression-not-extensible-no-trailing-comma.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-no-trailing-comma.case
 // - src/dynamic-import/syntax/invalid/nested-arrow-assignment-expression.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-no-new-call-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-no-new-call-expression.js
index 145fd3672ef1..eb01ac06e198 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-no-new-call-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-no-new-call-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-new-call-expression.case
 // - src/dynamic-import/syntax/invalid/nested-arrow.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-no-rest-param.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-no-rest-param.js
index e8d1ffc39c3c..478a6e6e61a7 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-no-rest-param.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-no-rest-param.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-rest-param.case
 // - src/dynamic-import/syntax/invalid/nested-arrow.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-not-extensible-args.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-not-extensible-args.js
index 9c54387c3a2f..584b948e8b60 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-not-extensible-args.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-not-extensible-args.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-args.case
 // - src/dynamic-import/syntax/invalid/nested-arrow.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-not-extensible-no-trailing-comma.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-not-extensible-no-trailing-comma.js
index 090136b46d50..3275d21247c2 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-not-extensible-no-trailing-comma.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-arrow-not-extensible-no-trailing-comma.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-no-trailing-comma.case
 // - src/dynamic-import/syntax/invalid/nested-arrow.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-await-assignment-expr-not-optional.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-await-assignment-expr-not-optional.js
index 5cd10e9d934d..d23affee6767 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-await-assignment-expr-not-optional.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-await-assignment-expr-not-optional.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/assignment-expr-not-optional.case
 // - src/dynamic-import/syntax/invalid/nested-async-arrow-fn-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-await-no-new-call-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-await-no-new-call-expression.js
index c06d34440ddc..7fa729203aea 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-await-no-new-call-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-await-no-new-call-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-new-call-expression.case
 // - src/dynamic-import/syntax/invalid/nested-async-arrow-fn-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-await-no-rest-param.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-await-no-rest-param.js
index 222812680e5e..db97c974f37c 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-await-no-rest-param.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-await-no-rest-param.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-rest-param.case
 // - src/dynamic-import/syntax/invalid/nested-async-arrow-fn-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-await-not-extensible-args.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-await-not-extensible-args.js
index c3a4aa66fec4..597446434cb8 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-await-not-extensible-args.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-await-not-extensible-args.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-args.case
 // - src/dynamic-import/syntax/invalid/nested-async-arrow-fn-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-await-not-extensible-no-trailing-comma.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-await-not-extensible-no-trailing-comma.js
index 75eeb6ad88c2..390a4f4b1968 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-await-not-extensible-no-trailing-comma.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-await-not-extensible-no-trailing-comma.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-no-trailing-comma.case
 // - src/dynamic-import/syntax/invalid/nested-async-arrow-fn-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-return-await-assignment-expr-not-optional.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-return-await-assignment-expr-not-optional.js
index a349b15fc81b..56a16cb32996 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-return-await-assignment-expr-not-optional.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-return-await-assignment-expr-not-optional.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/assignment-expr-not-optional.case
 // - src/dynamic-import/syntax/invalid/nested-async-arrow-fn-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-return-await-no-new-call-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-return-await-no-new-call-expression.js
index 6b33cf2e4774..063c210c1169 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-return-await-no-new-call-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-return-await-no-new-call-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-new-call-expression.case
 // - src/dynamic-import/syntax/invalid/nested-async-arrow-fn-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-return-await-no-rest-param.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-return-await-no-rest-param.js
index 19d0cd94b937..69d757e1a296 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-return-await-no-rest-param.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-return-await-no-rest-param.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-rest-param.case
 // - src/dynamic-import/syntax/invalid/nested-async-arrow-fn-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-return-await-not-extensible-args.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-return-await-not-extensible-args.js
index 3e960bfaef78..626b88cf3525 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-return-await-not-extensible-args.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-return-await-not-extensible-args.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-args.case
 // - src/dynamic-import/syntax/invalid/nested-async-arrow-fn-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-return-await-not-extensible-no-trailing-comma.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-return-await-not-extensible-no-trailing-comma.js
index bbe4f071ed44..34564a553f58 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-return-await-not-extensible-no-trailing-comma.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-arrow-function-return-await-not-extensible-no-trailing-comma.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-no-trailing-comma.case
 // - src/dynamic-import/syntax/invalid/nested-async-arrow-fn-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-assignment-expr-not-optional.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-assignment-expr-not-optional.js
index f41d9ff14d5d..64e028851748 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-assignment-expr-not-optional.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-assignment-expr-not-optional.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/assignment-expr-not-optional.case
 // - src/dynamic-import/syntax/invalid/nested-async-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-await-assignment-expr-not-optional.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-await-assignment-expr-not-optional.js
index d1bf625e5704..e9407de28422 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-await-assignment-expr-not-optional.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-await-assignment-expr-not-optional.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/assignment-expr-not-optional.case
 // - src/dynamic-import/syntax/invalid/nested-async-function-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-await-no-new-call-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-await-no-new-call-expression.js
index 01d36264f007..a9be6667c8d1 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-await-no-new-call-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-await-no-new-call-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-new-call-expression.case
 // - src/dynamic-import/syntax/invalid/nested-async-function-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-await-no-rest-param.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-await-no-rest-param.js
index dbf1c62cfa01..312ff9dffb10 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-await-no-rest-param.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-await-no-rest-param.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-rest-param.case
 // - src/dynamic-import/syntax/invalid/nested-async-function-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-await-not-extensible-args.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-await-not-extensible-args.js
index fdfc46d3d748..af0223d09aa0 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-await-not-extensible-args.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-await-not-extensible-args.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-args.case
 // - src/dynamic-import/syntax/invalid/nested-async-function-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-await-not-extensible-no-trailing-comma.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-await-not-extensible-no-trailing-comma.js
index 1eefe63a6c06..5f4d88bca175 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-await-not-extensible-no-trailing-comma.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-await-not-extensible-no-trailing-comma.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-no-trailing-comma.case
 // - src/dynamic-import/syntax/invalid/nested-async-function-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-no-new-call-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-no-new-call-expression.js
index 0f1c9fe21b90..c09b46804dbb 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-no-new-call-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-no-new-call-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-new-call-expression.case
 // - src/dynamic-import/syntax/invalid/nested-async-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-no-rest-param.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-no-rest-param.js
index d63e9c9c5f80..084cd47f808c 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-no-rest-param.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-no-rest-param.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-rest-param.case
 // - src/dynamic-import/syntax/invalid/nested-async-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-not-extensible-args.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-not-extensible-args.js
index ccd07298fe2e..9e74c5c413c7 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-not-extensible-args.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-not-extensible-args.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-args.case
 // - src/dynamic-import/syntax/invalid/nested-async-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-not-extensible-no-trailing-comma.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-not-extensible-no-trailing-comma.js
index ca9d5cd9cf07..48890a1f7065 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-not-extensible-no-trailing-comma.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-not-extensible-no-trailing-comma.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-no-trailing-comma.case
 // - src/dynamic-import/syntax/invalid/nested-async-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-return-await-assignment-expr-not-optional.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-return-await-assignment-expr-not-optional.js
index a78a8a821bc4..fa2cdea7da86 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-return-await-assignment-expr-not-optional.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-return-await-assignment-expr-not-optional.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/assignment-expr-not-optional.case
 // - src/dynamic-import/syntax/invalid/nested-async-function-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-return-await-no-new-call-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-return-await-no-new-call-expression.js
index af7017f8e592..770ea593f659 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-return-await-no-new-call-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-return-await-no-new-call-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-new-call-expression.case
 // - src/dynamic-import/syntax/invalid/nested-async-function-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-return-await-no-rest-param.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-return-await-no-rest-param.js
index 48d4cc8c5072..9da80ad92cad 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-return-await-no-rest-param.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-return-await-no-rest-param.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-rest-param.case
 // - src/dynamic-import/syntax/invalid/nested-async-function-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-return-await-not-extensible-args.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-return-await-not-extensible-args.js
index 01ea24ce41ad..2246f680b08e 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-return-await-not-extensible-args.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-return-await-not-extensible-args.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-args.case
 // - src/dynamic-import/syntax/invalid/nested-async-function-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-return-await-not-extensible-no-trailing-comma.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-return-await-not-extensible-no-trailing-comma.js
index fffb24f0b86c..c4396a18b883 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-return-await-not-extensible-no-trailing-comma.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-function-return-await-not-extensible-no-trailing-comma.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-no-trailing-comma.case
 // - src/dynamic-import/syntax/invalid/nested-async-function-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-gen-await-assignment-expr-not-optional.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-gen-await-assignment-expr-not-optional.js
index 3c0354c36706..846305e4f6cf 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-gen-await-assignment-expr-not-optional.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-gen-await-assignment-expr-not-optional.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/assignment-expr-not-optional.case
 // - src/dynamic-import/syntax/invalid/nested-async-generator-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-gen-await-no-new-call-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-gen-await-no-new-call-expression.js
index a180c76d2e42..d430579cee8a 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-gen-await-no-new-call-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-gen-await-no-new-call-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-new-call-expression.case
 // - src/dynamic-import/syntax/invalid/nested-async-generator-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-gen-await-no-rest-param.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-gen-await-no-rest-param.js
index 3a36475b6614..1eb87cc41294 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-gen-await-no-rest-param.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-gen-await-no-rest-param.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-rest-param.case
 // - src/dynamic-import/syntax/invalid/nested-async-generator-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-gen-await-not-extensible-args.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-gen-await-not-extensible-args.js
index 96a565577d9e..05781c2adbad 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-gen-await-not-extensible-args.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-gen-await-not-extensible-args.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-args.case
 // - src/dynamic-import/syntax/invalid/nested-async-generator-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-gen-await-not-extensible-no-trailing-comma.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-gen-await-not-extensible-no-trailing-comma.js
index 55a0d847cf95..91a0a20bfe51 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-gen-await-not-extensible-no-trailing-comma.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-async-gen-await-not-extensible-no-trailing-comma.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-no-trailing-comma.case
 // - src/dynamic-import/syntax/invalid/nested-async-generator-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-assignment-expr-not-optional.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-assignment-expr-not-optional.js
index 7452bd129a68..704a7e696085 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-assignment-expr-not-optional.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-assignment-expr-not-optional.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/assignment-expr-not-optional.case
 // - src/dynamic-import/syntax/invalid/nested-block.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-labeled-assignment-expr-not-optional.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-labeled-assignment-expr-not-optional.js
index d0315f0f99fb..5014b8e2c380 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-labeled-assignment-expr-not-optional.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-labeled-assignment-expr-not-optional.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/assignment-expr-not-optional.case
 // - src/dynamic-import/syntax/invalid/nested-block-labeled.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-labeled-no-new-call-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-labeled-no-new-call-expression.js
index e7d2e7b7723c..cb543f69fd92 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-labeled-no-new-call-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-labeled-no-new-call-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-new-call-expression.case
 // - src/dynamic-import/syntax/invalid/nested-block-labeled.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-labeled-no-rest-param.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-labeled-no-rest-param.js
index 256450971b9d..4afb47521b5d 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-labeled-no-rest-param.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-labeled-no-rest-param.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-rest-param.case
 // - src/dynamic-import/syntax/invalid/nested-block-labeled.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-labeled-not-extensible-args.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-labeled-not-extensible-args.js
index 680ed379bd96..33af6a77b475 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-labeled-not-extensible-args.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-labeled-not-extensible-args.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-args.case
 // - src/dynamic-import/syntax/invalid/nested-block-labeled.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-labeled-not-extensible-no-trailing-comma.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-labeled-not-extensible-no-trailing-comma.js
index 1662b00af498..9fed08904389 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-labeled-not-extensible-no-trailing-comma.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-labeled-not-extensible-no-trailing-comma.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-no-trailing-comma.case
 // - src/dynamic-import/syntax/invalid/nested-block-labeled.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-no-new-call-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-no-new-call-expression.js
index 6e519ad4a028..0b71922f0082 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-no-new-call-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-no-new-call-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-new-call-expression.case
 // - src/dynamic-import/syntax/invalid/nested-block.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-no-rest-param.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-no-rest-param.js
index d7cf1caee1b0..654357601143 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-no-rest-param.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-no-rest-param.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-rest-param.case
 // - src/dynamic-import/syntax/invalid/nested-block.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-not-extensible-args.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-not-extensible-args.js
index 47c7e7cbf45d..d878d851cda9 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-not-extensible-args.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-not-extensible-args.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-args.case
 // - src/dynamic-import/syntax/invalid/nested-block.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-not-extensible-no-trailing-comma.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-not-extensible-no-trailing-comma.js
index feb70e6edbd2..d99e8ab7437a 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-not-extensible-no-trailing-comma.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-block-not-extensible-no-trailing-comma.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-no-trailing-comma.case
 // - src/dynamic-import/syntax/invalid/nested-block.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-do-while-assignment-expr-not-optional.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-do-while-assignment-expr-not-optional.js
index f8b900e5f5b6..b1b227836a26 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-do-while-assignment-expr-not-optional.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-do-while-assignment-expr-not-optional.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/assignment-expr-not-optional.case
 // - src/dynamic-import/syntax/invalid/nested-do-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-do-while-no-new-call-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-do-while-no-new-call-expression.js
index 7d7c6a03f6f4..6cdb8257995b 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-do-while-no-new-call-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-do-while-no-new-call-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-new-call-expression.case
 // - src/dynamic-import/syntax/invalid/nested-do-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-do-while-no-rest-param.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-do-while-no-rest-param.js
index d13e75409018..0e268248b08a 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-do-while-no-rest-param.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-do-while-no-rest-param.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-rest-param.case
 // - src/dynamic-import/syntax/invalid/nested-do-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-do-while-not-extensible-args.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-do-while-not-extensible-args.js
index 86cd06d55a87..e8f82ef9818f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-do-while-not-extensible-args.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-do-while-not-extensible-args.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-args.case
 // - src/dynamic-import/syntax/invalid/nested-do-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-do-while-not-extensible-no-trailing-comma.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-do-while-not-extensible-no-trailing-comma.js
index a288b308cd49..1ac5384983b2 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-do-while-not-extensible-no-trailing-comma.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-do-while-not-extensible-no-trailing-comma.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-no-trailing-comma.case
 // - src/dynamic-import/syntax/invalid/nested-do-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-assignment-expr-not-optional.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-assignment-expr-not-optional.js
index c5e65e3052d9..d178b46e7234 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-assignment-expr-not-optional.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-assignment-expr-not-optional.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/assignment-expr-not-optional.case
 // - src/dynamic-import/syntax/invalid/nested-else.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-braceless-assignment-expr-not-optional.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-braceless-assignment-expr-not-optional.js
index 37dba7bca7e5..ef36d9577b87 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-braceless-assignment-expr-not-optional.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-braceless-assignment-expr-not-optional.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/assignment-expr-not-optional.case
 // - src/dynamic-import/syntax/invalid/nested-else-braceless.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-braceless-no-new-call-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-braceless-no-new-call-expression.js
index c889b7640dcb..b40a3fd5f21a 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-braceless-no-new-call-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-braceless-no-new-call-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-new-call-expression.case
 // - src/dynamic-import/syntax/invalid/nested-else-braceless.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-braceless-no-rest-param.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-braceless-no-rest-param.js
index 7bbc550c016d..4b0b0ffc596e 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-braceless-no-rest-param.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-braceless-no-rest-param.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-rest-param.case
 // - src/dynamic-import/syntax/invalid/nested-else-braceless.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-braceless-not-extensible-args.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-braceless-not-extensible-args.js
index 9f800394a3f6..779a13e0ee29 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-braceless-not-extensible-args.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-braceless-not-extensible-args.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-args.case
 // - src/dynamic-import/syntax/invalid/nested-else-braceless.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-braceless-not-extensible-no-trailing-comma.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-braceless-not-extensible-no-trailing-comma.js
index 644194729cbf..ce0d5bb50d83 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-braceless-not-extensible-no-trailing-comma.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-braceless-not-extensible-no-trailing-comma.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-no-trailing-comma.case
 // - src/dynamic-import/syntax/invalid/nested-else-braceless.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-no-new-call-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-no-new-call-expression.js
index 77a98f987911..f26f98ac72a3 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-no-new-call-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-no-new-call-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-new-call-expression.case
 // - src/dynamic-import/syntax/invalid/nested-else.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-no-rest-param.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-no-rest-param.js
index 6175daa81830..69025eff3736 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-no-rest-param.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-no-rest-param.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-rest-param.case
 // - src/dynamic-import/syntax/invalid/nested-else.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-not-extensible-args.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-not-extensible-args.js
index 8dabcc36f2be..d2ba4d2fc76c 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-not-extensible-args.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-not-extensible-args.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-args.case
 // - src/dynamic-import/syntax/invalid/nested-else.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-not-extensible-no-trailing-comma.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-not-extensible-no-trailing-comma.js
index e157f1d8e8ae..bfa74672ac43 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-not-extensible-no-trailing-comma.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-else-not-extensible-no-trailing-comma.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-no-trailing-comma.case
 // - src/dynamic-import/syntax/invalid/nested-else.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-assignment-expr-not-optional.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-assignment-expr-not-optional.js
index 733ddc3d1213..9e66f99bcde3 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-assignment-expr-not-optional.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-assignment-expr-not-optional.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/assignment-expr-not-optional.case
 // - src/dynamic-import/syntax/invalid/nested-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-no-new-call-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-no-new-call-expression.js
index a5de34d505d8..30d51e87d714 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-no-new-call-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-no-new-call-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-new-call-expression.case
 // - src/dynamic-import/syntax/invalid/nested-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-no-rest-param.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-no-rest-param.js
index b559e8451153..fda5fd11a203 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-no-rest-param.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-no-rest-param.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-rest-param.case
 // - src/dynamic-import/syntax/invalid/nested-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-not-extensible-args.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-not-extensible-args.js
index 6a922556bb1e..db975a9daa25 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-not-extensible-args.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-not-extensible-args.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-args.case
 // - src/dynamic-import/syntax/invalid/nested-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-not-extensible-no-trailing-comma.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-not-extensible-no-trailing-comma.js
index 945b60fade64..a46894bfaba8 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-not-extensible-no-trailing-comma.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-not-extensible-no-trailing-comma.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-no-trailing-comma.case
 // - src/dynamic-import/syntax/invalid/nested-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-return-assignment-expr-not-optional.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-return-assignment-expr-not-optional.js
index d3e7f516d21b..4d1a6938b9a7 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-return-assignment-expr-not-optional.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-return-assignment-expr-not-optional.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/assignment-expr-not-optional.case
 // - src/dynamic-import/syntax/invalid/nested-function-return.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-return-no-new-call-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-return-no-new-call-expression.js
index cd075b0620eb..3e4cd2503a3e 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-return-no-new-call-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-return-no-new-call-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-new-call-expression.case
 // - src/dynamic-import/syntax/invalid/nested-function-return.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-return-no-rest-param.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-return-no-rest-param.js
index 480fa1dca4f4..49d338979457 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-return-no-rest-param.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-return-no-rest-param.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-rest-param.case
 // - src/dynamic-import/syntax/invalid/nested-function-return.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-return-not-extensible-args.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-return-not-extensible-args.js
index 7753a4b3895b..0608e238b362 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-return-not-extensible-args.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-return-not-extensible-args.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-args.case
 // - src/dynamic-import/syntax/invalid/nested-function-return.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-return-not-extensible-no-trailing-comma.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-return-not-extensible-no-trailing-comma.js
index defbacad8afa..81368a18b8be 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-return-not-extensible-no-trailing-comma.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-function-return-not-extensible-no-trailing-comma.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-no-trailing-comma.case
 // - src/dynamic-import/syntax/invalid/nested-function-return.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-assignment-expr-not-optional.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-assignment-expr-not-optional.js
index 111d3ccb1d2c..41e343191b6e 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-assignment-expr-not-optional.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-assignment-expr-not-optional.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/assignment-expr-not-optional.case
 // - src/dynamic-import/syntax/invalid/nested-if.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-braceless-assignment-expr-not-optional.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-braceless-assignment-expr-not-optional.js
index 574c1f8d5adf..7ee93844c456 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-braceless-assignment-expr-not-optional.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-braceless-assignment-expr-not-optional.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/assignment-expr-not-optional.case
 // - src/dynamic-import/syntax/invalid/nested-if-braceless.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-braceless-no-new-call-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-braceless-no-new-call-expression.js
index b893a436bdac..17d8fe3d3c5f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-braceless-no-new-call-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-braceless-no-new-call-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-new-call-expression.case
 // - src/dynamic-import/syntax/invalid/nested-if-braceless.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-braceless-no-rest-param.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-braceless-no-rest-param.js
index 3eb570d65e25..18e551f53299 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-braceless-no-rest-param.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-braceless-no-rest-param.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-rest-param.case
 // - src/dynamic-import/syntax/invalid/nested-if-braceless.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-braceless-not-extensible-args.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-braceless-not-extensible-args.js
index 38737cb85872..86204e845079 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-braceless-not-extensible-args.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-braceless-not-extensible-args.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-args.case
 // - src/dynamic-import/syntax/invalid/nested-if-braceless.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-braceless-not-extensible-no-trailing-comma.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-braceless-not-extensible-no-trailing-comma.js
index b3bd69e6c235..20e90e7e4e0a 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-braceless-not-extensible-no-trailing-comma.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-braceless-not-extensible-no-trailing-comma.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-no-trailing-comma.case
 // - src/dynamic-import/syntax/invalid/nested-if-braceless.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-no-new-call-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-no-new-call-expression.js
index dffc90d5b5da..753f03ed7d44 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-no-new-call-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-no-new-call-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-new-call-expression.case
 // - src/dynamic-import/syntax/invalid/nested-if.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-no-rest-param.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-no-rest-param.js
index bedc90ae5790..d4099b18a1d0 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-no-rest-param.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-no-rest-param.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-rest-param.case
 // - src/dynamic-import/syntax/invalid/nested-if.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-not-extensible-args.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-not-extensible-args.js
index 796ee0d5c0ee..a20aa31e00ef 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-not-extensible-args.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-not-extensible-args.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-args.case
 // - src/dynamic-import/syntax/invalid/nested-if.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-not-extensible-no-trailing-comma.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-not-extensible-no-trailing-comma.js
index 2e7d0438928a..13839e4ee300 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-not-extensible-no-trailing-comma.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-if-not-extensible-no-trailing-comma.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-no-trailing-comma.case
 // - src/dynamic-import/syntax/invalid/nested-if.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-while-assignment-expr-not-optional.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-while-assignment-expr-not-optional.js
index 3824f6665545..a4a25aec6ad5 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-while-assignment-expr-not-optional.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-while-assignment-expr-not-optional.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/assignment-expr-not-optional.case
 // - src/dynamic-import/syntax/invalid/nested-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-while-no-new-call-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-while-no-new-call-expression.js
index cea4fd2a3b13..85b3edfc81ed 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-while-no-new-call-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-while-no-new-call-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-new-call-expression.case
 // - src/dynamic-import/syntax/invalid/nested-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-while-no-rest-param.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-while-no-rest-param.js
index adc7101b5d2f..ef5802da439e 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-while-no-rest-param.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-while-no-rest-param.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-rest-param.case
 // - src/dynamic-import/syntax/invalid/nested-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-while-not-extensible-args.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-while-not-extensible-args.js
index 5e1ff30370d2..6e19174674ab 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-while-not-extensible-args.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-while-not-extensible-args.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-args.case
 // - src/dynamic-import/syntax/invalid/nested-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-while-not-extensible-no-trailing-comma.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-while-not-extensible-no-trailing-comma.js
index 63562724b83f..d749dae582bf 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-while-not-extensible-no-trailing-comma.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-while-not-extensible-no-trailing-comma.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-no-trailing-comma.case
 // - src/dynamic-import/syntax/invalid/nested-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-assignment-expr-not-optional.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-assignment-expr-not-optional.js
index 1efe4f35a4a2..ae8e2c0f7b3c 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-assignment-expr-not-optional.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-assignment-expr-not-optional.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/assignment-expr-not-optional.case
 // - src/dynamic-import/syntax/invalid/nested-with.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-expression-assignment-expr-not-optional.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-expression-assignment-expr-not-optional.js
index 525d257b32d8..d5001a395e7b 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-expression-assignment-expr-not-optional.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-expression-assignment-expr-not-optional.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/assignment-expr-not-optional.case
 // - src/dynamic-import/syntax/invalid/nested-with-expression.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-expression-no-new-call-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-expression-no-new-call-expression.js
index b06217b80636..86a719e19149 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-expression-no-new-call-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-expression-no-new-call-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-new-call-expression.case
 // - src/dynamic-import/syntax/invalid/nested-with-expression.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-expression-no-rest-param.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-expression-no-rest-param.js
index 5d548553288c..156e654da1e7 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-expression-no-rest-param.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-expression-no-rest-param.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-rest-param.case
 // - src/dynamic-import/syntax/invalid/nested-with-expression.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-expression-not-extensible-args.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-expression-not-extensible-args.js
index 25449d368d9e..76645946fa7e 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-expression-not-extensible-args.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-expression-not-extensible-args.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-args.case
 // - src/dynamic-import/syntax/invalid/nested-with-expression.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-expression-not-extensible-no-trailing-comma.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-expression-not-extensible-no-trailing-comma.js
index 4d37737ae12c..3e069f61d551 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-expression-not-extensible-no-trailing-comma.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-expression-not-extensible-no-trailing-comma.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-no-trailing-comma.case
 // - src/dynamic-import/syntax/invalid/nested-with-expression.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-no-new-call-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-no-new-call-expression.js
index 9fb213a4345c..c00e86190223 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-no-new-call-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-no-new-call-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-new-call-expression.case
 // - src/dynamic-import/syntax/invalid/nested-with.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-no-rest-param.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-no-rest-param.js
index b0e2175d602e..893e11b1b4d3 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-no-rest-param.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-no-rest-param.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-rest-param.case
 // - src/dynamic-import/syntax/invalid/nested-with.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-not-extensible-args.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-not-extensible-args.js
index a7432f9f19a5..0393f840d4b2 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-not-extensible-args.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-not-extensible-args.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-args.case
 // - src/dynamic-import/syntax/invalid/nested-with.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-not-extensible-no-trailing-comma.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-not-extensible-no-trailing-comma.js
index 585932f99554..7ca99f5ef29f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-not-extensible-no-trailing-comma.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/nested-with-not-extensible-no-trailing-comma.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-no-trailing-comma.case
 // - src/dynamic-import/syntax/invalid/nested-with.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/top-level-assignment-expr-not-optional.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/top-level-assignment-expr-not-optional.js
index 8e8cf5e3a618..0bd8e6154702 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/top-level-assignment-expr-not-optional.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/top-level-assignment-expr-not-optional.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/assignment-expr-not-optional.case
 // - src/dynamic-import/syntax/invalid/top-level.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/top-level-no-new-call-expression.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/top-level-no-new-call-expression.js
index f76970cdda94..a550e83e75b1 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/top-level-no-new-call-expression.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/top-level-no-new-call-expression.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-new-call-expression.case
 // - src/dynamic-import/syntax/invalid/top-level.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/top-level-no-rest-param.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/top-level-no-rest-param.js
index 27490e9c1d6c..08b0284cfa0d 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/top-level-no-rest-param.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/top-level-no-rest-param.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/no-rest-param.case
 // - src/dynamic-import/syntax/invalid/top-level.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/top-level-not-extensible-args.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/top-level-not-extensible-args.js
index 430d890ac5cd..4d2507288974 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/top-level-not-extensible-args.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/top-level-not-extensible-args.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-args.case
 // - src/dynamic-import/syntax/invalid/top-level.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/top-level-not-extensible-no-trailing-comma.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/top-level-not-extensible-no-trailing-comma.js
index 93fc45397603..65a283ab2f55 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/top-level-not-extensible-no-trailing-comma.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/invalid/top-level-not-extensible-no-trailing-comma.js
@@ -1,4 +1,4 @@
-// |reftest| error:SyntaxError
+// |reftest| skip-if(!xulRuntime.shell) error:SyntaxError -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/not-extensible-no-trailing-comma.case
 // - src/dynamic-import/syntax/invalid/top-level.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/callexpression-arguments.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/callexpression-arguments.js
index 8595d0302bd7..8c28ebc0e17b 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/callexpression-arguments.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/callexpression-arguments.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/callexpression-templateliteral.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/callexpression-templateliteral.js
index e1f0e8efec73..f47b422e7e84 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/callexpression-templateliteral.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/callexpression-templateliteral.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-assignment-expression-empty-str-is-valid-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-assignment-expression-empty-str-is-valid-assign-expr.js
index e955bbb9a0cf..3b57afafa26b 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-assignment-expression-empty-str-is-valid-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-assignment-expression-empty-str-is-valid-assign-expr.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/empty-str-is-valid-assign-expr.case
 // - src/dynamic-import/syntax/valid/nested-arrow-assignment-expression.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-assignment-expression-nested-imports.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-assignment-expression-nested-imports.js
index 8deb72acb36a..2f61faa24f81 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-assignment-expression-nested-imports.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-assignment-expression-nested-imports.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/nested-imports.case
 // - src/dynamic-import/syntax/valid/nested-arrow-assignment-expression.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-assignment-expression-script-code-valid.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-assignment-expression-script-code-valid.js
index 7e4f5036f15e..d4388d41adec 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-assignment-expression-script-code-valid.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-assignment-expression-script-code-valid.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/script-code-valid.case
 // - src/dynamic-import/syntax/valid/nested-arrow-assignment-expression.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-empty-str-is-valid-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-empty-str-is-valid-assign-expr.js
index a05ffce406c9..2895c19bfff7 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-empty-str-is-valid-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-empty-str-is-valid-assign-expr.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/empty-str-is-valid-assign-expr.case
 // - src/dynamic-import/syntax/valid/nested-arrow.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-nested-imports.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-nested-imports.js
index b0a9667aebd4..f5aae322278c 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-nested-imports.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-nested-imports.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/nested-imports.case
 // - src/dynamic-import/syntax/valid/nested-arrow.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-script-code-valid.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-script-code-valid.js
index 741fdc0d0b4f..763743eedc32 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-script-code-valid.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-arrow-script-code-valid.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/script-code-valid.case
 // - src/dynamic-import/syntax/valid/nested-arrow.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-await-empty-str-is-valid-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-await-empty-str-is-valid-assign-expr.js
index c315362dd3cc..4eb1b665a431 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-await-empty-str-is-valid-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-await-empty-str-is-valid-assign-expr.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/empty-str-is-valid-assign-expr.case
 // - src/dynamic-import/syntax/valid/nested-async-arrow-fn-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-await-nested-imports.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-await-nested-imports.js
index e765b20f9916..112c381903eb 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-await-nested-imports.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-await-nested-imports.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/nested-imports.case
 // - src/dynamic-import/syntax/valid/nested-async-arrow-fn-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-await-script-code-valid.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-await-script-code-valid.js
index a6ce646fc3f9..54fef285051c 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-await-script-code-valid.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-await-script-code-valid.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/script-code-valid.case
 // - src/dynamic-import/syntax/valid/nested-async-arrow-fn-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-return-await-empty-str-is-valid-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-return-await-empty-str-is-valid-assign-expr.js
index 2d98675c6328..248aa3d6123f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-return-await-empty-str-is-valid-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-return-await-empty-str-is-valid-assign-expr.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/empty-str-is-valid-assign-expr.case
 // - src/dynamic-import/syntax/valid/nested-async-arrow-fn-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-return-await-nested-imports.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-return-await-nested-imports.js
index 26139457d540..8e7cd8fac0e1 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-return-await-nested-imports.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-return-await-nested-imports.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/nested-imports.case
 // - src/dynamic-import/syntax/valid/nested-async-arrow-fn-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-return-await-script-code-valid.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-return-await-script-code-valid.js
index e37ef590fc65..57616398b4ef 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-return-await-script-code-valid.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-arrow-function-return-await-script-code-valid.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/script-code-valid.case
 // - src/dynamic-import/syntax/valid/nested-async-arrow-fn-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-await-empty-str-is-valid-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-await-empty-str-is-valid-assign-expr.js
index dd7fa9c1cb5a..a3c2453f5c70 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-await-empty-str-is-valid-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-await-empty-str-is-valid-assign-expr.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/empty-str-is-valid-assign-expr.case
 // - src/dynamic-import/syntax/valid/nested-async-function-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-await-nested-imports.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-await-nested-imports.js
index 0ddf51fbbf5d..8ec029de775c 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-await-nested-imports.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-await-nested-imports.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/nested-imports.case
 // - src/dynamic-import/syntax/valid/nested-async-function-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-await-script-code-valid.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-await-script-code-valid.js
index 9d0ac95e80d7..3a7e1aa18059 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-await-script-code-valid.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-await-script-code-valid.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/script-code-valid.case
 // - src/dynamic-import/syntax/valid/nested-async-function-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-empty-str-is-valid-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-empty-str-is-valid-assign-expr.js
index 85ef89317dc6..53f479857970 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-empty-str-is-valid-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-empty-str-is-valid-assign-expr.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/empty-str-is-valid-assign-expr.case
 // - src/dynamic-import/syntax/valid/nested-async-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-nested-imports.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-nested-imports.js
index 54968605019c..bbfd991e9f11 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-nested-imports.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-nested-imports.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/nested-imports.case
 // - src/dynamic-import/syntax/valid/nested-async-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-return-await-empty-str-is-valid-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-return-await-empty-str-is-valid-assign-expr.js
index 841c9ecec523..42e4ded0fe6f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-return-await-empty-str-is-valid-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-return-await-empty-str-is-valid-assign-expr.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/empty-str-is-valid-assign-expr.case
 // - src/dynamic-import/syntax/valid/nested-async-function-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-return-await-nested-imports.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-return-await-nested-imports.js
index 19923a3e028c..ec33964d871d 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-return-await-nested-imports.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-return-await-nested-imports.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/nested-imports.case
 // - src/dynamic-import/syntax/valid/nested-async-function-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-return-await-script-code-valid.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-return-await-script-code-valid.js
index 29f03b5979f4..c026918eb8a4 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-return-await-script-code-valid.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-return-await-script-code-valid.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/script-code-valid.case
 // - src/dynamic-import/syntax/valid/nested-async-function-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-script-code-valid.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-script-code-valid.js
index 3e46e919d870..584a024e571d 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-script-code-valid.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-function-script-code-valid.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/script-code-valid.case
 // - src/dynamic-import/syntax/valid/nested-async-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-gen-await-empty-str-is-valid-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-gen-await-empty-str-is-valid-assign-expr.js
index 2b2bf388f9a9..c3d3ef9034aa 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-gen-await-empty-str-is-valid-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-gen-await-empty-str-is-valid-assign-expr.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/empty-str-is-valid-assign-expr.case
 // - src/dynamic-import/syntax/valid/nested-async-generator-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-gen-await-nested-imports.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-gen-await-nested-imports.js
index 2bceef772c19..37b5648ac5af 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-gen-await-nested-imports.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-gen-await-nested-imports.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/nested-imports.case
 // - src/dynamic-import/syntax/valid/nested-async-generator-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-gen-await-script-code-valid.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-gen-await-script-code-valid.js
index f68873e33c46..a1cbf2dbb712 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-gen-await-script-code-valid.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-async-gen-await-script-code-valid.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/script-code-valid.case
 // - src/dynamic-import/syntax/valid/nested-async-generator-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-empty-str-is-valid-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-empty-str-is-valid-assign-expr.js
index 8a4ce486e6a6..04cbb3fefbf6 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-empty-str-is-valid-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-empty-str-is-valid-assign-expr.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/empty-str-is-valid-assign-expr.case
 // - src/dynamic-import/syntax/valid/nested-block.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-labeled-empty-str-is-valid-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-labeled-empty-str-is-valid-assign-expr.js
index 9a0c26c38496..866fbd0a0298 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-labeled-empty-str-is-valid-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-labeled-empty-str-is-valid-assign-expr.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/empty-str-is-valid-assign-expr.case
 // - src/dynamic-import/syntax/valid/nested-block-labeled.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-labeled-nested-imports.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-labeled-nested-imports.js
index 0a6c213a0987..24cdf5c98e35 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-labeled-nested-imports.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-labeled-nested-imports.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/nested-imports.case
 // - src/dynamic-import/syntax/valid/nested-block-labeled.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-labeled-script-code-valid.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-labeled-script-code-valid.js
index 60a102a72d64..268f695ca44c 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-labeled-script-code-valid.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-labeled-script-code-valid.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/script-code-valid.case
 // - src/dynamic-import/syntax/valid/nested-block-labeled.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-nested-imports.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-nested-imports.js
index 64cdff395eb5..34c278bc7ec1 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-nested-imports.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-nested-imports.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/nested-imports.case
 // - src/dynamic-import/syntax/valid/nested-block.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-script-code-valid.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-script-code-valid.js
index 7aa37521ce30..30989a919f02 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-script-code-valid.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-block-script-code-valid.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/script-code-valid.case
 // - src/dynamic-import/syntax/valid/nested-block.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-do-while-empty-str-is-valid-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-do-while-empty-str-is-valid-assign-expr.js
index e6043a1de02a..d0f861213c0e 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-do-while-empty-str-is-valid-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-do-while-empty-str-is-valid-assign-expr.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/empty-str-is-valid-assign-expr.case
 // - src/dynamic-import/syntax/valid/nested-do-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-do-while-nested-imports.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-do-while-nested-imports.js
index 418aef238c8d..f2c61a8ed403 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-do-while-nested-imports.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-do-while-nested-imports.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/nested-imports.case
 // - src/dynamic-import/syntax/valid/nested-do-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-do-while-script-code-valid.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-do-while-script-code-valid.js
index 49845ade2567..d8990f42845a 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-do-while-script-code-valid.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-do-while-script-code-valid.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/script-code-valid.case
 // - src/dynamic-import/syntax/valid/nested-do-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-braceless-empty-str-is-valid-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-braceless-empty-str-is-valid-assign-expr.js
index 834ff1175256..b3c76f2c4def 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-braceless-empty-str-is-valid-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-braceless-empty-str-is-valid-assign-expr.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/empty-str-is-valid-assign-expr.case
 // - src/dynamic-import/syntax/valid/nested-else-braceless.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-braceless-nested-imports.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-braceless-nested-imports.js
index a61351882ee1..226e9b7e56ad 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-braceless-nested-imports.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-braceless-nested-imports.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/nested-imports.case
 // - src/dynamic-import/syntax/valid/nested-else-braceless.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-braceless-script-code-valid.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-braceless-script-code-valid.js
index 02ae2a1dbac2..b8b21515633e 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-braceless-script-code-valid.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-braceless-script-code-valid.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/script-code-valid.case
 // - src/dynamic-import/syntax/valid/nested-else-braceless.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-empty-str-is-valid-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-empty-str-is-valid-assign-expr.js
index 1f70f4ea4aca..781c51f93a29 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-empty-str-is-valid-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-empty-str-is-valid-assign-expr.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/empty-str-is-valid-assign-expr.case
 // - src/dynamic-import/syntax/valid/nested-else.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-nested-imports.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-nested-imports.js
index aa6b0cc9ed7d..1375f941b85f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-nested-imports.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-nested-imports.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/nested-imports.case
 // - src/dynamic-import/syntax/valid/nested-else.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-script-code-valid.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-script-code-valid.js
index 5dcf45a12dd6..b8786de6db30 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-script-code-valid.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-else-script-code-valid.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/script-code-valid.case
 // - src/dynamic-import/syntax/valid/nested-else.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-empty-str-is-valid-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-empty-str-is-valid-assign-expr.js
index ec67d53dd02b..7ed3d2dfeb49 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-empty-str-is-valid-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-empty-str-is-valid-assign-expr.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/empty-str-is-valid-assign-expr.case
 // - src/dynamic-import/syntax/valid/nested-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-nested-imports.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-nested-imports.js
index 6e8a69d1eb6a..807db84804b9 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-nested-imports.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-nested-imports.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/nested-imports.case
 // - src/dynamic-import/syntax/valid/nested-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-return-empty-str-is-valid-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-return-empty-str-is-valid-assign-expr.js
index c052d7657f38..abd14f8bdce8 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-return-empty-str-is-valid-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-return-empty-str-is-valid-assign-expr.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/empty-str-is-valid-assign-expr.case
 // - src/dynamic-import/syntax/valid/nested-function-return.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-return-nested-imports.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-return-nested-imports.js
index 9be10d628397..cabca0a40118 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-return-nested-imports.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-return-nested-imports.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/nested-imports.case
 // - src/dynamic-import/syntax/valid/nested-function-return.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-return-script-code-valid.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-return-script-code-valid.js
index 57f8cecc6252..1bb80ff6297f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-return-script-code-valid.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-return-script-code-valid.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/script-code-valid.case
 // - src/dynamic-import/syntax/valid/nested-function-return.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-script-code-valid.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-script-code-valid.js
index a41a004fa380..0844ed4791cc 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-script-code-valid.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-function-script-code-valid.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/script-code-valid.case
 // - src/dynamic-import/syntax/valid/nested-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-braceless-empty-str-is-valid-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-braceless-empty-str-is-valid-assign-expr.js
index 63558887aa38..2073575715a5 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-braceless-empty-str-is-valid-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-braceless-empty-str-is-valid-assign-expr.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/empty-str-is-valid-assign-expr.case
 // - src/dynamic-import/syntax/valid/nested-if-braceless.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-braceless-nested-imports.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-braceless-nested-imports.js
index 0c1bdc571c45..dec59df09caf 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-braceless-nested-imports.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-braceless-nested-imports.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/nested-imports.case
 // - src/dynamic-import/syntax/valid/nested-if-braceless.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-braceless-script-code-valid.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-braceless-script-code-valid.js
index f78e35ebca82..e782b47a51fb 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-braceless-script-code-valid.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-braceless-script-code-valid.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/script-code-valid.case
 // - src/dynamic-import/syntax/valid/nested-if-braceless.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-empty-str-is-valid-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-empty-str-is-valid-assign-expr.js
index f0560d87fe7c..2f85b8530d7c 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-empty-str-is-valid-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-empty-str-is-valid-assign-expr.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/empty-str-is-valid-assign-expr.case
 // - src/dynamic-import/syntax/valid/nested-if.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-nested-imports.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-nested-imports.js
index 0ace039de11a..ad65059dbb17 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-nested-imports.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-nested-imports.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/nested-imports.case
 // - src/dynamic-import/syntax/valid/nested-if.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-script-code-valid.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-script-code-valid.js
index 0ad0e108bdab..21e2aeadb9e4 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-script-code-valid.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-if-script-code-valid.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/script-code-valid.case
 // - src/dynamic-import/syntax/valid/nested-if.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-while-empty-str-is-valid-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-while-empty-str-is-valid-assign-expr.js
index 049326f40fd3..3ec8dc4f5916 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-while-empty-str-is-valid-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-while-empty-str-is-valid-assign-expr.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/empty-str-is-valid-assign-expr.case
 // - src/dynamic-import/syntax/valid/nested-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-while-nested-imports.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-while-nested-imports.js
index 5546b9f707c7..102425d9c491 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-while-nested-imports.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-while-nested-imports.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/nested-imports.case
 // - src/dynamic-import/syntax/valid/nested-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-while-script-code-valid.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-while-script-code-valid.js
index f9e6972172bf..f519cee2691e 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-while-script-code-valid.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-while-script-code-valid.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/script-code-valid.case
 // - src/dynamic-import/syntax/valid/nested-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-empty-str-is-valid-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-empty-str-is-valid-assign-expr.js
index f4bea3870038..790e1f7dacdc 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-empty-str-is-valid-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-empty-str-is-valid-assign-expr.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/empty-str-is-valid-assign-expr.case
 // - src/dynamic-import/syntax/valid/nested-with.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-expression-empty-str-is-valid-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-expression-empty-str-is-valid-assign-expr.js
index 56e377cbcbb5..58570c784086 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-expression-empty-str-is-valid-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-expression-empty-str-is-valid-assign-expr.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/empty-str-is-valid-assign-expr.case
 // - src/dynamic-import/syntax/valid/nested-with-expression.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-expression-nested-imports.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-expression-nested-imports.js
index d9a43dc54ab4..2002acc5e3e6 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-expression-nested-imports.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-expression-nested-imports.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/nested-imports.case
 // - src/dynamic-import/syntax/valid/nested-with-expression.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-expression-script-code-valid.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-expression-script-code-valid.js
index d8e3483c4f48..18f266b3d1b2 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-expression-script-code-valid.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-expression-script-code-valid.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/script-code-valid.case
 // - src/dynamic-import/syntax/valid/nested-with-expression.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-nested-imports.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-nested-imports.js
index 374e945f5d0d..fcc1524c6277 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-nested-imports.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-nested-imports.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/nested-imports.case
 // - src/dynamic-import/syntax/valid/nested-with.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-script-code-valid.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-script-code-valid.js
index c43d901209d7..d0882f6c92e1 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-script-code-valid.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/nested-with-script-code-valid.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/script-code-valid.case
 // - src/dynamic-import/syntax/valid/nested-with.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/new-covered-expression-is-valid.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/new-covered-expression-is-valid.js
index 79df1a493b6c..c9ea7e40b510 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/new-covered-expression-is-valid.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/new-covered-expression-is-valid.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/top-level-empty-str-is-valid-assign-expr.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/top-level-empty-str-is-valid-assign-expr.js
index f25156b57991..4a43d27a0925 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/top-level-empty-str-is-valid-assign-expr.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/top-level-empty-str-is-valid-assign-expr.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/empty-str-is-valid-assign-expr.case
 // - src/dynamic-import/syntax/valid/top-level.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/top-level-nested-imports.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/top-level-nested-imports.js
index 596b9ed2a20a..a21fb77622a3 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/top-level-nested-imports.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/top-level-nested-imports.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/nested-imports.case
 // - src/dynamic-import/syntax/valid/top-level.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/top-level-script-code-valid.js b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/top-level-script-code-valid.js
index 43d711668f80..2b9eb428e686 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/top-level-script-code-valid.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/syntax/valid/top-level-script-code-valid.js
@@ -1,4 +1,4 @@
-// |reftest| 
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/script-code-valid.case
 // - src/dynamic-import/syntax/valid/top-level.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/update-to-dynamic-import.js b/js/src/tests/test262/language/expressions/dynamic-import/update-to-dynamic-import.js
index d7ea33d6b396..b81c56befa66 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/update-to-dynamic-import.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/update-to-dynamic-import.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage-from-eval.js b/js/src/tests/test262/language/expressions/dynamic-import/usage-from-eval.js
index 379eebda41f4..77edaafedc58 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage-from-eval.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage-from-eval.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // Copyright (C) 2018 Leo Balter. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-eval-gtbndng-indirect-update-dflt.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-eval-gtbndng-indirect-update-dflt.js
index 36f15d8f8a6b..6e148893976b 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-eval-gtbndng-indirect-update-dflt.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-eval-gtbndng-indirect-update-dflt.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update-dflt.case
 // - src/dynamic-import/default/nested-arrow-assign-expr.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-eval-gtbndng-indirect-update.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-eval-gtbndng-indirect-update.js
index 1583daf5548e..c38ae63b04d5 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-eval-gtbndng-indirect-update.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-eval-gtbndng-indirect-update.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update.case
 // - src/dynamic-import/default/nested-arrow-assign-expr.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-eval-script-code-host-resolves-module-code.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-eval-script-code-host-resolves-module-code.js
index 09c4d51abce9..78002a7009d6 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-eval-script-code-host-resolves-module-code.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-eval-script-code-host-resolves-module-code.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-host-resolves-module-code.case
 // - src/dynamic-import/default/nested-arrow-assign-expr.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-is-call-expression-square-brackets.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-is-call-expression-square-brackets.js
index e74ed00a0afc..5268a3cedd6e 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-is-call-expression-square-brackets.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-is-call-expression-square-brackets.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/is-call-expression-square-brackets.case
 // - src/dynamic-import/default/nested-arrow-assign-expr.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-returns-thenable.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-returns-thenable.js
index b72f8acdf6fe..0656e8b0e187 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-returns-thenable.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-returns-thenable.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/returns-thenable.case
 // - src/dynamic-import/default/nested-arrow-assign-expr.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-specifier-tostring.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-specifier-tostring.js
index bc7e9691e781..4a064d46b583 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-specifier-tostring.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-assignment-expression-specifier-tostring.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring.case
 // - src/dynamic-import/default/nested-arrow-assign-expr.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-eval-gtbndng-indirect-update-dflt.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-eval-gtbndng-indirect-update-dflt.js
index a0bf48a31715..46e9db8ffc2b 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-eval-gtbndng-indirect-update-dflt.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-eval-gtbndng-indirect-update-dflt.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update-dflt.case
 // - src/dynamic-import/default/nested-arrow.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-eval-gtbndng-indirect-update.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-eval-gtbndng-indirect-update.js
index c1635683d57f..30192de84190 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-eval-gtbndng-indirect-update.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-eval-gtbndng-indirect-update.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update.case
 // - src/dynamic-import/default/nested-arrow.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-eval-script-code-host-resolves-module-code.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-eval-script-code-host-resolves-module-code.js
index 25bffd31256a..a50d9f3c01d0 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-eval-script-code-host-resolves-module-code.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-eval-script-code-host-resolves-module-code.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-host-resolves-module-code.case
 // - src/dynamic-import/default/nested-arrow.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-is-call-expression-square-brackets.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-is-call-expression-square-brackets.js
index eb23184762f3..b0aa82c905ba 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-is-call-expression-square-brackets.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-is-call-expression-square-brackets.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/is-call-expression-square-brackets.case
 // - src/dynamic-import/default/nested-arrow.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-returns-thenable.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-returns-thenable.js
index b726b0af63c9..225df98b18e6 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-returns-thenable.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-returns-thenable.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/returns-thenable.case
 // - src/dynamic-import/default/nested-arrow.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-specifier-tostring.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-specifier-tostring.js
index 178645940375..70cf2d241188 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-specifier-tostring.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-arrow-import-then-specifier-tostring.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring.case
 // - src/dynamic-import/default/nested-arrow.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-eval-gtbndng-indirect-update-dflt.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-eval-gtbndng-indirect-update-dflt.js
index 96bb4e0f5eaf..485a8e31c5ef 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-eval-gtbndng-indirect-update-dflt.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-eval-gtbndng-indirect-update-dflt.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update-dflt.case
 // - src/dynamic-import/default/nested-async-arrow-fn-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-eval-gtbndng-indirect-update.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-eval-gtbndng-indirect-update.js
index 4d41cbbf72f9..23a6edcfa5a6 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-eval-gtbndng-indirect-update.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-eval-gtbndng-indirect-update.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update.case
 // - src/dynamic-import/default/nested-async-arrow-fn-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-eval-script-code-host-resolves-module-code.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-eval-script-code-host-resolves-module-code.js
index 96c55dfd4eb2..7661d2fdb227 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-eval-script-code-host-resolves-module-code.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-eval-script-code-host-resolves-module-code.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-host-resolves-module-code.case
 // - src/dynamic-import/default/nested-async-arrow-fn-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-is-call-expression-square-brackets.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-is-call-expression-square-brackets.js
index 6a728be5652b..a2f9f226d1d4 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-is-call-expression-square-brackets.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-is-call-expression-square-brackets.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/is-call-expression-square-brackets.case
 // - src/dynamic-import/default/nested-async-arrow-fn-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-returns-thenable.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-returns-thenable.js
index 54532aee3514..9387b2d95a7a 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-returns-thenable.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-returns-thenable.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/returns-thenable.case
 // - src/dynamic-import/default/nested-async-arrow-fn-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-specifier-tostring.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-specifier-tostring.js
index f2049a371f17..8358851ae230 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-specifier-tostring.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-await-specifier-tostring.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring.case
 // - src/dynamic-import/default/nested-async-arrow-fn-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-eval-gtbndng-indirect-update-dflt.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-eval-gtbndng-indirect-update-dflt.js
index 48d00234e676..3cc52004b654 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-eval-gtbndng-indirect-update-dflt.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-eval-gtbndng-indirect-update-dflt.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update-dflt.case
 // - src/dynamic-import/default/nested-async-arrow-fn-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-eval-gtbndng-indirect-update.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-eval-gtbndng-indirect-update.js
index cbc86a731063..e81098a30f78 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-eval-gtbndng-indirect-update.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-eval-gtbndng-indirect-update.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update.case
 // - src/dynamic-import/default/nested-async-arrow-fn-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-eval-script-code-host-resolves-module-code.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-eval-script-code-host-resolves-module-code.js
index b34185b3f1e8..16ee45d73803 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-eval-script-code-host-resolves-module-code.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-eval-script-code-host-resolves-module-code.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-host-resolves-module-code.case
 // - src/dynamic-import/default/nested-async-arrow-fn-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-is-call-expression-square-brackets.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-is-call-expression-square-brackets.js
index 9e6ca6d5a1dc..ff680debb93b 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-is-call-expression-square-brackets.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-is-call-expression-square-brackets.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/is-call-expression-square-brackets.case
 // - src/dynamic-import/default/nested-async-arrow-fn-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-returns-thenable.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-returns-thenable.js
index 0966039602c1..96bf48553fde 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-returns-thenable.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-returns-thenable.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/returns-thenable.case
 // - src/dynamic-import/default/nested-async-arrow-fn-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-specifier-tostring.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-specifier-tostring.js
index ec215b63ad22..4f73805cb53b 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-specifier-tostring.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-arrow-function-return-await-specifier-tostring.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring.case
 // - src/dynamic-import/default/nested-async-arrow-fn-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-eval-gtbndng-indirect-update-dflt.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-eval-gtbndng-indirect-update-dflt.js
index b8c3d616c252..2434af90e2a3 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-eval-gtbndng-indirect-update-dflt.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-eval-gtbndng-indirect-update-dflt.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update-dflt.case
 // - src/dynamic-import/default/nested-async-function-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-eval-gtbndng-indirect-update.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-eval-gtbndng-indirect-update.js
index 709f3cb835b1..60a6e3380dbd 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-eval-gtbndng-indirect-update.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-eval-gtbndng-indirect-update.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update.case
 // - src/dynamic-import/default/nested-async-function-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-eval-script-code-host-resolves-module-code.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-eval-script-code-host-resolves-module-code.js
index 49578b592815..3c17a54e29e8 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-eval-script-code-host-resolves-module-code.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-eval-script-code-host-resolves-module-code.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-host-resolves-module-code.case
 // - src/dynamic-import/default/nested-async-function-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-is-call-expression-square-brackets.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-is-call-expression-square-brackets.js
index ca178d6a8fe6..0b298cc82dde 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-is-call-expression-square-brackets.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-is-call-expression-square-brackets.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/is-call-expression-square-brackets.case
 // - src/dynamic-import/default/nested-async-function-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-returns-thenable.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-returns-thenable.js
index 24eb32af4155..529cb6b24287 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-returns-thenable.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-returns-thenable.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/returns-thenable.case
 // - src/dynamic-import/default/nested-async-function-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-specifier-tostring.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-specifier-tostring.js
index 1755c7b19c5c..c17049991133 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-specifier-tostring.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-await-specifier-tostring.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring.case
 // - src/dynamic-import/default/nested-async-function-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-eval-gtbndng-indirect-update-dflt.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-eval-gtbndng-indirect-update-dflt.js
index 1ef68166f6f8..8f091589642f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-eval-gtbndng-indirect-update-dflt.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-eval-gtbndng-indirect-update-dflt.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update-dflt.case
 // - src/dynamic-import/default/nested-async-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-eval-gtbndng-indirect-update.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-eval-gtbndng-indirect-update.js
index 6cd13636689a..e26afd6322c0 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-eval-gtbndng-indirect-update.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-eval-gtbndng-indirect-update.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update.case
 // - src/dynamic-import/default/nested-async-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-eval-script-code-host-resolves-module-code.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-eval-script-code-host-resolves-module-code.js
index 71148fc8f78a..62e0b6065f15 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-eval-script-code-host-resolves-module-code.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-eval-script-code-host-resolves-module-code.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-host-resolves-module-code.case
 // - src/dynamic-import/default/nested-async-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-is-call-expression-square-brackets.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-is-call-expression-square-brackets.js
index 6be68e18dd0f..255c111a8aa1 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-is-call-expression-square-brackets.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-is-call-expression-square-brackets.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/is-call-expression-square-brackets.case
 // - src/dynamic-import/default/nested-async-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-eval-gtbndng-indirect-update-dflt.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-eval-gtbndng-indirect-update-dflt.js
index c93c23756e2e..1c09006a7244 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-eval-gtbndng-indirect-update-dflt.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-eval-gtbndng-indirect-update-dflt.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update-dflt.case
 // - src/dynamic-import/default/nested-async-function-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-eval-gtbndng-indirect-update.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-eval-gtbndng-indirect-update.js
index 51efea8fe9f6..6c6742a61975 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-eval-gtbndng-indirect-update.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-eval-gtbndng-indirect-update.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update.case
 // - src/dynamic-import/default/nested-async-function-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-eval-script-code-host-resolves-module-code.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-eval-script-code-host-resolves-module-code.js
index 173933e313c2..d5efb6153460 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-eval-script-code-host-resolves-module-code.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-eval-script-code-host-resolves-module-code.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-host-resolves-module-code.case
 // - src/dynamic-import/default/nested-async-function-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-is-call-expression-square-brackets.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-is-call-expression-square-brackets.js
index ec4304ac4c4e..634d29faabba 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-is-call-expression-square-brackets.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-is-call-expression-square-brackets.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/is-call-expression-square-brackets.case
 // - src/dynamic-import/default/nested-async-function-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-returns-thenable.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-returns-thenable.js
index 0541c6003416..3892f031423c 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-returns-thenable.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-returns-thenable.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/returns-thenable.case
 // - src/dynamic-import/default/nested-async-function-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-specifier-tostring.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-specifier-tostring.js
index 06d862734432..8b6200f1e90f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-specifier-tostring.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-return-await-specifier-tostring.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring.case
 // - src/dynamic-import/default/nested-async-function-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-returns-thenable.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-returns-thenable.js
index 943efb3acd4b..3817d33f4093 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-returns-thenable.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-returns-thenable.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/returns-thenable.case
 // - src/dynamic-import/default/nested-async-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-specifier-tostring.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-specifier-tostring.js
index 8a143d8599ba..b61f7e0e0afe 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-specifier-tostring.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-function-specifier-tostring.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring.case
 // - src/dynamic-import/default/nested-async-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-eval-gtbndng-indirect-update-dflt.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-eval-gtbndng-indirect-update-dflt.js
index a68e7fd34bed..23c49069b472 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-eval-gtbndng-indirect-update-dflt.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-eval-gtbndng-indirect-update-dflt.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update-dflt.case
 // - src/dynamic-import/default/nested-async-generator-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-eval-gtbndng-indirect-update.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-eval-gtbndng-indirect-update.js
index 3338d4147b30..be79005b1f25 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-eval-gtbndng-indirect-update.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-eval-gtbndng-indirect-update.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update.case
 // - src/dynamic-import/default/nested-async-generator-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-eval-script-code-host-resolves-module-code.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-eval-script-code-host-resolves-module-code.js
index 4c21eaf1b508..1fe5ed2e3161 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-eval-script-code-host-resolves-module-code.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-eval-script-code-host-resolves-module-code.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-host-resolves-module-code.case
 // - src/dynamic-import/default/nested-async-generator-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-is-call-expression-square-brackets.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-is-call-expression-square-brackets.js
index 45d0e3e46cd0..4b8ffba5ed7e 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-is-call-expression-square-brackets.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-is-call-expression-square-brackets.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/is-call-expression-square-brackets.case
 // - src/dynamic-import/default/nested-async-generator-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-returns-thenable.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-returns-thenable.js
index 37cd989f72b8..365545a8f968 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-returns-thenable.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-returns-thenable.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/returns-thenable.case
 // - src/dynamic-import/default/nested-async-generator-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-specifier-tostring.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-specifier-tostring.js
index f3026eafe465..fc340121df2e 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-specifier-tostring.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-await-specifier-tostring.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring.case
 // - src/dynamic-import/default/nested-async-generator-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-eval-gtbndng-indirect-update-dflt.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-eval-gtbndng-indirect-update-dflt.js
index 89ef67785e66..31efff9c7837 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-eval-gtbndng-indirect-update-dflt.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-eval-gtbndng-indirect-update-dflt.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update-dflt.case
 // - src/dynamic-import/default/nested-async-generator-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-eval-gtbndng-indirect-update.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-eval-gtbndng-indirect-update.js
index fadba635ac6a..846f158bfc61 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-eval-gtbndng-indirect-update.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-eval-gtbndng-indirect-update.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update.case
 // - src/dynamic-import/default/nested-async-generator-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-eval-script-code-host-resolves-module-code.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-eval-script-code-host-resolves-module-code.js
index dcceb57262de..e57f9ac8ad33 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-eval-script-code-host-resolves-module-code.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-eval-script-code-host-resolves-module-code.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-host-resolves-module-code.case
 // - src/dynamic-import/default/nested-async-generator-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-is-call-expression-square-brackets.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-is-call-expression-square-brackets.js
index ea5d5d29cb34..f821355bec69 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-is-call-expression-square-brackets.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-is-call-expression-square-brackets.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/is-call-expression-square-brackets.case
 // - src/dynamic-import/default/nested-async-generator-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-returns-thenable.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-returns-thenable.js
index 6cc1665780fe..83589bfef1f5 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-returns-thenable.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-returns-thenable.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/returns-thenable.case
 // - src/dynamic-import/default/nested-async-generator-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-specifier-tostring.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-specifier-tostring.js
index ee8c0e37a48b..cfc8f38e4132 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-specifier-tostring.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-async-gen-return-await-specifier-tostring.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring.case
 // - src/dynamic-import/default/nested-async-generator-return-await.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-eval-gtbndng-indirect-update-dflt.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-eval-gtbndng-indirect-update-dflt.js
index 53df067f508e..79d56c511eca 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-eval-gtbndng-indirect-update-dflt.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-eval-gtbndng-indirect-update-dflt.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update-dflt.case
 // - src/dynamic-import/default/nested-block.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-eval-gtbndng-indirect-update.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-eval-gtbndng-indirect-update.js
index 9e91b0f93a83..d5a3143aeae8 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-eval-gtbndng-indirect-update.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-eval-gtbndng-indirect-update.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update.case
 // - src/dynamic-import/default/nested-block.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-eval-script-code-host-resolves-module-code.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-eval-script-code-host-resolves-module-code.js
index 73047f13b495..233c3106bc9a 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-eval-script-code-host-resolves-module-code.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-eval-script-code-host-resolves-module-code.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-host-resolves-module-code.case
 // - src/dynamic-import/default/nested-block.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-is-call-expression-square-brackets.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-is-call-expression-square-brackets.js
index 7d78f0d9dd15..67f664ece0c6 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-is-call-expression-square-brackets.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-is-call-expression-square-brackets.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/is-call-expression-square-brackets.case
 // - src/dynamic-import/default/nested-block.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-returns-thenable.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-returns-thenable.js
index a5340ac60c21..89151a2171f1 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-returns-thenable.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-returns-thenable.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/returns-thenable.case
 // - src/dynamic-import/default/nested-block.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-specifier-tostring.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-specifier-tostring.js
index cb120c4178ba..ba1b7183ae61 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-specifier-tostring.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-block-import-then-specifier-tostring.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring.case
 // - src/dynamic-import/default/nested-block.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-eval-gtbndng-indirect-update-dflt.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-eval-gtbndng-indirect-update-dflt.js
index 05280a20cb3e..d2f5c0dfdca5 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-eval-gtbndng-indirect-update-dflt.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-eval-gtbndng-indirect-update-dflt.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update-dflt.case
 // - src/dynamic-import/default/nested-do-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-eval-gtbndng-indirect-update.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-eval-gtbndng-indirect-update.js
index dc299c152683..b52e371705d2 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-eval-gtbndng-indirect-update.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-eval-gtbndng-indirect-update.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update.case
 // - src/dynamic-import/default/nested-do-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-eval-script-code-host-resolves-module-code.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-eval-script-code-host-resolves-module-code.js
index 0d03d24facf7..c827fc2009b1 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-eval-script-code-host-resolves-module-code.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-eval-script-code-host-resolves-module-code.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-host-resolves-module-code.case
 // - src/dynamic-import/default/nested-do-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-is-call-expression-square-brackets.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-is-call-expression-square-brackets.js
index aac39da6f70b..221512f4dd29 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-is-call-expression-square-brackets.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-is-call-expression-square-brackets.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/is-call-expression-square-brackets.case
 // - src/dynamic-import/default/nested-do-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-returns-thenable.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-returns-thenable.js
index 7cd332dd3cf8..7f1ebc3edd1e 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-returns-thenable.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-returns-thenable.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/returns-thenable.case
 // - src/dynamic-import/default/nested-do-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-specifier-tostring.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-specifier-tostring.js
index 3e783d9a2e1d..c788a1089cbd 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-specifier-tostring.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-do-while-specifier-tostring.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring.case
 // - src/dynamic-import/default/nested-do-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-eval-gtbndng-indirect-update-dflt.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-eval-gtbndng-indirect-update-dflt.js
index 8d720dfcdd87..78a15702bb43 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-eval-gtbndng-indirect-update-dflt.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-eval-gtbndng-indirect-update-dflt.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update-dflt.case
 // - src/dynamic-import/default/nested-else.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-eval-gtbndng-indirect-update.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-eval-gtbndng-indirect-update.js
index 76881bbd68b4..51558c6e83e7 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-eval-gtbndng-indirect-update.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-eval-gtbndng-indirect-update.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update.case
 // - src/dynamic-import/default/nested-else.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-eval-script-code-host-resolves-module-code.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-eval-script-code-host-resolves-module-code.js
index fd0ba3df2c8b..5f9557d2ca12 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-eval-script-code-host-resolves-module-code.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-eval-script-code-host-resolves-module-code.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-host-resolves-module-code.case
 // - src/dynamic-import/default/nested-else.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-is-call-expression-square-brackets.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-is-call-expression-square-brackets.js
index 0afb5bb05776..b883e1dc8f4e 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-is-call-expression-square-brackets.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-is-call-expression-square-brackets.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/is-call-expression-square-brackets.case
 // - src/dynamic-import/default/nested-else.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-returns-thenable.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-returns-thenable.js
index b3d67e51e909..7020b30ff530 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-returns-thenable.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-returns-thenable.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/returns-thenable.case
 // - src/dynamic-import/default/nested-else.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-specifier-tostring.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-specifier-tostring.js
index ea52ff800baa..9518dc94d429 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-specifier-tostring.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-else-import-then-specifier-tostring.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring.case
 // - src/dynamic-import/default/nested-else.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-eval-gtbndng-indirect-update-dflt.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-eval-gtbndng-indirect-update-dflt.js
index 1569bca4ef79..ff82b04783bc 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-eval-gtbndng-indirect-update-dflt.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-eval-gtbndng-indirect-update-dflt.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update-dflt.case
 // - src/dynamic-import/default/nested-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-eval-gtbndng-indirect-update.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-eval-gtbndng-indirect-update.js
index 2b0717cc51be..6213d1067c70 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-eval-gtbndng-indirect-update.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-eval-gtbndng-indirect-update.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update.case
 // - src/dynamic-import/default/nested-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-eval-script-code-host-resolves-module-code.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-eval-script-code-host-resolves-module-code.js
index 1c5d97e52545..aaba709bbcd3 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-eval-script-code-host-resolves-module-code.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-eval-script-code-host-resolves-module-code.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-host-resolves-module-code.case
 // - src/dynamic-import/default/nested-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-is-call-expression-square-brackets.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-is-call-expression-square-brackets.js
index ce08c628805e..f8af9c66242b 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-is-call-expression-square-brackets.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-is-call-expression-square-brackets.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/is-call-expression-square-brackets.case
 // - src/dynamic-import/default/nested-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-returns-thenable.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-returns-thenable.js
index 53883c18667b..6a4dfed178de 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-returns-thenable.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-returns-thenable.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/returns-thenable.case
 // - src/dynamic-import/default/nested-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-specifier-tostring.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-specifier-tostring.js
index 7d9a85620329..dd610d7cd7f6 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-specifier-tostring.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-function-import-then-specifier-tostring.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring.case
 // - src/dynamic-import/default/nested-function.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-eval-gtbndng-indirect-update-dflt.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-eval-gtbndng-indirect-update-dflt.js
index 537bdd60118e..672167b2baf3 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-eval-gtbndng-indirect-update-dflt.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-eval-gtbndng-indirect-update-dflt.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update-dflt.case
 // - src/dynamic-import/default/nested-if-braceless.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-eval-gtbndng-indirect-update.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-eval-gtbndng-indirect-update.js
index fe09649d9be9..f6b5e10d6b77 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-eval-gtbndng-indirect-update.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-eval-gtbndng-indirect-update.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update.case
 // - src/dynamic-import/default/nested-if-braceless.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-eval-script-code-host-resolves-module-code.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-eval-script-code-host-resolves-module-code.js
index e41cca756593..0ac464c01323 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-eval-script-code-host-resolves-module-code.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-eval-script-code-host-resolves-module-code.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-host-resolves-module-code.case
 // - src/dynamic-import/default/nested-if-braceless.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-is-call-expression-square-brackets.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-is-call-expression-square-brackets.js
index 8260dd98d20b..03dd4547c57c 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-is-call-expression-square-brackets.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-is-call-expression-square-brackets.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/is-call-expression-square-brackets.case
 // - src/dynamic-import/default/nested-if-braceless.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-returns-thenable.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-returns-thenable.js
index 1701a0f191a9..6cbb520ad764 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-returns-thenable.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-returns-thenable.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/returns-thenable.case
 // - src/dynamic-import/default/nested-if-braceless.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-specifier-tostring.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-specifier-tostring.js
index ca9c72241f0a..6645b407d01b 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-specifier-tostring.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-braceless-specifier-tostring.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring.case
 // - src/dynamic-import/default/nested-if-braceless.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-eval-gtbndng-indirect-update-dflt.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-eval-gtbndng-indirect-update-dflt.js
index d895ed03eedf..4a41b2792794 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-eval-gtbndng-indirect-update-dflt.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-eval-gtbndng-indirect-update-dflt.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update-dflt.case
 // - src/dynamic-import/default/nested-if.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-eval-gtbndng-indirect-update.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-eval-gtbndng-indirect-update.js
index 42c3fbf79f7c..f6c65e01b3ac 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-eval-gtbndng-indirect-update.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-eval-gtbndng-indirect-update.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update.case
 // - src/dynamic-import/default/nested-if.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-eval-script-code-host-resolves-module-code.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-eval-script-code-host-resolves-module-code.js
index 2c0d6ca1cde9..b7a5f191c076 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-eval-script-code-host-resolves-module-code.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-eval-script-code-host-resolves-module-code.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-host-resolves-module-code.case
 // - src/dynamic-import/default/nested-if.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-is-call-expression-square-brackets.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-is-call-expression-square-brackets.js
index c10aa546e960..72ae24988662 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-is-call-expression-square-brackets.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-is-call-expression-square-brackets.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/is-call-expression-square-brackets.case
 // - src/dynamic-import/default/nested-if.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-returns-thenable.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-returns-thenable.js
index e16fce36373f..86ed3859e0bd 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-returns-thenable.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-returns-thenable.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/returns-thenable.case
 // - src/dynamic-import/default/nested-if.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-specifier-tostring.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-specifier-tostring.js
index 87f22a2aceee..39d07dc84ae7 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-specifier-tostring.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-if-import-then-specifier-tostring.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring.case
 // - src/dynamic-import/default/nested-if.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-eval-gtbndng-indirect-update-dflt.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-eval-gtbndng-indirect-update-dflt.js
index 5cb4e56d1667..3ce275418caf 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-eval-gtbndng-indirect-update-dflt.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-eval-gtbndng-indirect-update-dflt.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update-dflt.case
 // - src/dynamic-import/default/nested-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-eval-gtbndng-indirect-update.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-eval-gtbndng-indirect-update.js
index d2e757df6a19..13bb93452ebd 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-eval-gtbndng-indirect-update.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-eval-gtbndng-indirect-update.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update.case
 // - src/dynamic-import/default/nested-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-eval-script-code-host-resolves-module-code.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-eval-script-code-host-resolves-module-code.js
index 0fb62b6e7f18..de42a60fa73e 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-eval-script-code-host-resolves-module-code.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-eval-script-code-host-resolves-module-code.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-host-resolves-module-code.case
 // - src/dynamic-import/default/nested-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-is-call-expression-square-brackets.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-is-call-expression-square-brackets.js
index a4a2e321fb7f..1b6723cdf6b2 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-is-call-expression-square-brackets.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-is-call-expression-square-brackets.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/is-call-expression-square-brackets.case
 // - src/dynamic-import/default/nested-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-returns-thenable.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-returns-thenable.js
index 2d6ae02f6b0d..4e91ca880fdb 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-returns-thenable.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-returns-thenable.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/returns-thenable.case
 // - src/dynamic-import/default/nested-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-specifier-tostring.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-specifier-tostring.js
index 585e5d83654f..e974bd180415 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-specifier-tostring.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/nested-while-import-then-specifier-tostring.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring.case
 // - src/dynamic-import/default/nested-while.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-eval-gtbndng-indirect-update-dflt.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-eval-gtbndng-indirect-update-dflt.js
index baf1bf0076f8..d282086330e0 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-eval-gtbndng-indirect-update-dflt.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-eval-gtbndng-indirect-update-dflt.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update-dflt.case
 // - src/dynamic-import/default/nested-block-labeled.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-eval-gtbndng-indirect-update.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-eval-gtbndng-indirect-update.js
index e0c0154087a2..595a63902350 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-eval-gtbndng-indirect-update.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-eval-gtbndng-indirect-update.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update.case
 // - src/dynamic-import/default/nested-block-labeled.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-eval-script-code-host-resolves-module-code.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-eval-script-code-host-resolves-module-code.js
index de78996dd46a..29c3f49956f5 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-eval-script-code-host-resolves-module-code.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-eval-script-code-host-resolves-module-code.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-host-resolves-module-code.case
 // - src/dynamic-import/default/nested-block-labeled.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-is-call-expression-square-brackets.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-is-call-expression-square-brackets.js
index a604ebba9ce1..0f753e335e31 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-is-call-expression-square-brackets.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-is-call-expression-square-brackets.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/is-call-expression-square-brackets.case
 // - src/dynamic-import/default/nested-block-labeled.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-returns-thenable.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-returns-thenable.js
index 9eae36c213f0..04c24849c64f 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-returns-thenable.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-returns-thenable.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/returns-thenable.case
 // - src/dynamic-import/default/nested-block-labeled.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-specifier-tostring.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-specifier-tostring.js
index 484746638072..8c59879de1d3 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-specifier-tostring.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/syntax-nested-block-labeled-specifier-tostring.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring.case
 // - src/dynamic-import/default/nested-block-labeled.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-eval-gtbndng-indirect-update-dflt.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-eval-gtbndng-indirect-update-dflt.js
index 261bd82510c1..c67ac4f75eb8 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-eval-gtbndng-indirect-update-dflt.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-eval-gtbndng-indirect-update-dflt.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update-dflt.case
 // - src/dynamic-import/default/top-level.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-eval-gtbndng-indirect-update.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-eval-gtbndng-indirect-update.js
index 2a476f804f30..242fe0cd19fa 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-eval-gtbndng-indirect-update.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-eval-gtbndng-indirect-update.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-gtbndng-indirect-update.case
 // - src/dynamic-import/default/top-level.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-eval-script-code-host-resolves-module-code.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-eval-script-code-host-resolves-module-code.js
index e8e6f7578beb..9a7684fa88de 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-eval-script-code-host-resolves-module-code.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-eval-script-code-host-resolves-module-code.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/eval-script-code-host-resolves-module-code.case
 // - src/dynamic-import/default/top-level.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-is-call-expression-square-brackets.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-is-call-expression-square-brackets.js
index d0455884d6ff..6b87ff95a95e 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-is-call-expression-square-brackets.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-is-call-expression-square-brackets.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/is-call-expression-square-brackets.case
 // - src/dynamic-import/default/top-level.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-returns-thenable.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-returns-thenable.js
index ea980190d4ae..842b18976499 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-returns-thenable.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-returns-thenable.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/returns-thenable.case
 // - src/dynamic-import/default/top-level.template
diff --git a/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-specifier-tostring.js b/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-specifier-tostring.js
index 2aa63cc9d772..6d08ebbbe26d 100644
--- a/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-specifier-tostring.js
+++ b/js/src/tests/test262/language/expressions/dynamic-import/usage/top-level-import-then-specifier-tostring.js
@@ -1,3 +1,4 @@
+// |reftest| skip-if(!xulRuntime.shell) -- dynamic-import is not enabled unconditionally
 // This file was procedurally generated from the following sources:
 // - src/dynamic-import/specifier-tostring.case
 // - src/dynamic-import/default/top-level.template