Ok, this is somehow extensions related. Starting with --safe-mode results in a working version.
In my case I pinned it down to the firetray addon. Since it is unmaintained, I guess this is a won't fix. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1575708 Title: Firefox 46 works only with fresh profile To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1575708/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs