The mesa update on 2021-03-18 might be related. Is the problem observed if you run firefox in safe mode (firefox -safe- mode)?
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1919955 Title: weird graphics artifacts in Firefox on Xorg after upgrade To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1919955/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
