diff --git a/devtools/client/inspector/markup/test/browser_markup_remove_xul_attributes.js b/devtools/client/inspector/markup/test/browser_markup_remove_xul_attributes.js
index ee5b1185f9eb..7eca80eca22a 100644
--- a/devtools/client/inspector/markup/test/browser_markup_remove_xul_attributes.js
+++ b/devtools/client/inspector/markup/test/browser_markup_remove_xul_attributes.js
@@ -9,6 +9,10 @@
 const TEST_URL = URL_ROOT + "doc_markup_xul.xhtml";
 
 add_task(async function() {
+  await SpecialPowers.pushPermissions([
+    { type: "allowXULXBL", allow: true, context: URL_ROOT },
+  ]);
+
   const { inspector } = await openInspectorForURL(TEST_URL);
 
   const panelFront = await getNodeFront("#test", inspector);
diff --git a/devtools/client/inspector/rules/test/browser_rules_inactive_css_xul.js b/devtools/client/inspector/rules/test/browser_rules_inactive_css_xul.js
index 17ec291419e9..13f813bfe214 100644
--- a/devtools/client/inspector/rules/test/browser_rules_inactive_css_xul.js
+++ b/devtools/client/inspector/rules/test/browser_rules_inactive_css_xul.js
@@ -3,7 +3,7 @@
 
 "use strict";
 
-// Test inactive css properties in XUl documents.
+// Test inactive css properties in XUL documents.
 
 const TEST_URI = URL_ROOT + "doc_inactive_css_xul.xhtml";
 
@@ -29,6 +29,10 @@ const TEST_DATA = [
 ];
 
 add_task(async () => {
+  await SpecialPowers.pushPermissions([
+    { type: "allowXULXBL", allow: true, context: URL_ROOT },
+  ]);
+
   info("Open a url to a XUL document");
   await addTab(TEST_URI);
 
diff --git a/devtools/client/inspector/test/browser_inspector_highlighter-eyedropper-xul.js b/devtools/client/inspector/test/browser_inspector_highlighter-eyedropper-xul.js
index eaf2ab754a65..b5b7661eab94 100644
--- a/devtools/client/inspector/test/browser_inspector_highlighter-eyedropper-xul.js
+++ b/devtools/client/inspector/test/browser_inspector_highlighter-eyedropper-xul.js
@@ -11,6 +11,10 @@ const TEST_URL_2 =
   "data:text/html;charset=utf-8,<h1 style='color:red'>HTML test page</h1>";
 
 add_task(async function() {
+  await SpecialPowers.pushPermissions([
+    { type: "allowXULXBL", allow: true, context: URL_ROOT },
+  ]);
+
   const { inspector } = await openInspectorForURL(TEST_URL);
 
   info("Check the inspector toolbar");
diff --git a/devtools/server/tests/browser/browser_inspector-anonymous.js b/devtools/server/tests/browser/browser_inspector-anonymous.js
index 9022fc64d942..372a279a0a42 100644
--- a/devtools/server/tests/browser/browser_inspector-anonymous.js
+++ b/devtools/server/tests/browser/browser_inspector-anonymous.js
@@ -6,6 +6,10 @@
 // Test for Bug 777674
 
 add_task(async function() {
+  await SpecialPowers.pushPermissions([
+    { type: "allowXULXBL", allow: true, context: MAIN_DOMAIN },
+  ]);
+
   const { walker } = await initInspectorFront(
     MAIN_DOMAIN + "inspector-traversal-data.html"
   );
diff --git a/toolkit/components/tooltiptext/tests/browser_bug331772_xul_tooltiptext_in_html.js b/toolkit/components/tooltiptext/tests/browser_bug331772_xul_tooltiptext_in_html.js
index 67ff7148fd76..6bb1c958b848 100644
--- a/toolkit/components/tooltiptext/tests/browser_bug331772_xul_tooltiptext_in_html.js
+++ b/toolkit/components/tooltiptext/tests/browser_bug331772_xul_tooltiptext_in_html.js
@@ -2,6 +2,10 @@
  * Tests that the tooltiptext attribute is used for XUL elements in an HTML doc.
  */
 add_task(async function() {
+  await SpecialPowers.pushPermissions([
+    { type: "allowXULXBL", allow: true, context: "http://mochi.test:8888" },
+  ]);
+
   await BrowserTestUtils.withNewTab(
     {
       gBrowser,