confirming this behaviour as well. also "view page info" is freezing the browser. i just tried the version before, and this works fine (v63.0.3).
Start-Date: 2019-01-16 21:09:52 Commandline: apt upgrade [...] firefox:amd64 (63.0.3+build1-0ubuntu0.16.04.1, 64.0+build3-0ubuntu0.16.04.1) [...] -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1811105 Title: Browser hangs when 'open with' dialog opens. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1811105/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs