Bug 1708235 - Enable Private Fields Preference by default r=yulia,robwu

Differential Revision: https://phabricator.services.mozilla.com/D113704

js/src/tests/user.js

@@ -32,6 +32,5 @@ user_pref("browser.webapps.checkForUpdates", 0);
 user_pref("javascript.options.weakrefs", true);
 user_pref("javascript.options.experimental.weakrefs.expose_cleanupSome", true);
 user_pref("javascript.options.experimental.iterator_helpers", true);
-user_pref("javascript.options.experimental.private_fields", true);
 user_pref("javascript.options.experimental.top_level_await", true);
 user_pref("javascript.options.experimental.ergonomic_brand_checks", true);

js/xpconnect/tests/chrome/chrome.ini

@@ -32,7 +32,6 @@ support-files =
   !/js/xpconnect/tests/mochitest/file_evalInSandbox.html
   !/js/xpconnect/tests/mochitest/file_xrayic.html
 prefs =
-  javascript.options.experimental.private_fields=true
   javascript.options.large_arraybuffers=true
   javascript.options.experimental.ergonomic_brand_checks=true
   

js/xpconnect/tests/mochitest/mochitest.ini

@@ -41,7 +41,6 @@ support-files =
   bug1681664_helper.js
 prefs =
   javascript.options.weakrefs=true
-  javascript.options.experimental.private_fields=true
   javascript.options.experimental.ergonomic_brand_checks=true
   javascript.options.experimental.top_level_await=true
 

modules/libpref/init/StaticPrefList.yaml

@@ -5661,12 +5661,6 @@
     value: false
     mirror: always
 
-  # Experimental support for Private Fields in JavaScript.
--   name: javascript.options.experimental.private_fields
-    type: bool
-    value: false
-    mirror: always
-
   # Experimental support for Private Methods in JavaScript.
 -   name: javascript.options.experimental.private_methods
     type: bool
@@ -5674,6 +5668,12 @@
     mirror: always
 #endif  // NIGHTLY_BUILD
 
+  # Support for Private Fields in JavaScript.
+- name: javascript.options.experimental.private_fields
+  type: bool
+  value: true
+  mirror: always
+
   # Experimental support for the ergonomic brand check proposal.
 - name: javascript.options.experimental.ergonomic_brand_checks
   type: bool

toolkit/components/extensions/test/xpcshell/xpcshell-content.ini

@@ -1,7 +1,3 @@
-[DEFAULT]
-prefs =
-  javascript.options.experimental.private_fields=true
-
 [test_ext_i18n.js]
 skip-if = os == "android" || (os == "win" && debug) || (os == "linux")
 [test_ext_i18n_css.js]