Firefox 50.0 has been released on Nov 15th. Please see https://www.mozilla.org/en-US/firefox/50.0/releasenotes/ for the release notes.
Thank you for the bump request, but please wait at least 48h next time. https://wiki.gentoo.org/wiki/Bugzilla/Guide#Zero-day_bump_requests The mozilla team knows instantly, about new releases, but a complicate package like mozilla requires lots of man power. If you can provide help, have a look at: https://wiki.gentoo.org/wiki/Project:Mozilla
Bug #599924 is a dup. Thanks Gentoo devs for your effort.
*** This bug has been marked as a duplicate of bug 599924 ***