Bug 528456. Enable :scope support in querySelector and scoped stylesheets by default. r=dholbert

modules/libpref/src/init/all.js

@@ -1883,11 +1883,7 @@ pref("layout.css.prefixes.animations", true);
 pref("layout.css.prefixes.box-sizing", true);
 
 // Is support for the :scope selector enabled?
-#ifdef RELEASE_BUILD
-pref("layout.css.scope-pseudo.enabled", false);
-#else
 pref("layout.css.scope-pseudo.enabled", true);
-#endif
 
 // Is support for background-blend-mode enabled?
 pref("layout.css.background-blend-mode.enabled", true);