Possibly of interest will be the BugZilla item: <a href="https:&#x2F;&#x2F;bugzilla.mozilla.org&#x2F;show_bug.cgi?id=836758" rel="nofollow">https:&#x2F;&#x2F;bugzilla.mozilla.org&#x2F;show_bug.cgi?id=836758</a><p>Dates back to 2013, unsurprisingly has some more recent activity. :)