I have the same problem: after a security update last night on 20.04 LTS, firefox is now completely broken (displays a window frame with no content inside, ie it just copies the background image that was underneath on startup in the framebuffer?).
firefox does work if I pass it a URL at startup. $ firefox --full-version Mozilla Firefox 85.0 20210118153634 20210118153634 cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=20.04 DISTRIB_CODENAME=focal DISTRIB_DESCRIPTION="Ubuntu 20.04.2 LTS" This is a critical bug for my main browser on the Ubuntu LTS channel!! Please fix ASAP!!! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1914147 Title: [upstream] Firefox 85 hangs at startup To manage notifications about this bug go to: https://bugs.launchpad.net/firefox/+bug/1914147/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
