The old plan was to enable it in Fx 44 (the one that was just released). But a couple of bugs caused a delay and it was pushed back. It was just enabled in nightly&#x2F;dev builds [0], so Fx 46 will probably have it.<p>[0]: <a href="https:&#x2F;&#x2F;bugzilla.mozilla.org&#x2F;show_bug.cgi?id=1221206#c10" rel="nofollow">https:&#x2F;&#x2F;bugzilla.mozilla.org&#x2F;show_bug.cgi?id=1221206#c10</a>