Surely you can understand that an issue in a platform-specific implementation of a fairly obscure feature doesn't really support your assertion that it is "brok

Surely you can understand that an issue in a platform-specific implementation of a fairly obscure feature doesn't really support your assertion that it is "broken out of the box". It's likely that config option is not set by default because it's known to be buggy in some other way. You can read some discussion of this setting here, which has seen some activity in the past year, so it is being worked on: https://bugzilla.mozilla.org/show_bug.cgi?id=1403085 https://bugzilla.mozilla.org/show_bug.cgi?id=1403085