Bug 1555464 - Part 1: Turn the pref for public fields on by default. r=khyperia

Differential Revision: https://phabricator.services.mozilla.com/D34638

--HG--
extra : moz-landing-system : lando

modules/libpref/init/StaticPrefList.h

@@ -3835,7 +3835,7 @@ VARCACHE_PREF(
   Live,
   "javascript.options.experimental.fields",
   javascript_options_experimental_fields,
-  RelaxedAtomicBool, false
+  RelaxedAtomicBool, true
 )
 
 VARCACHE_PREF(

modules/libpref/init/all.js

@@ -1419,8 +1419,6 @@ pref("javascript.options.spectre.jit_to_C++_calls", true);
 // Streams API
 pref("javascript.options.streams", true);
 
-pref("javascript.options.experimental.fields", false);
-
 // Dynamic module import.
 pref("javascript.options.dynamicImport", true);