I can confirm it on Ubuntu 18.04, Firefox 67.0.4, NVidia video drivers, with any theme.
Interestingly enough, the corners are shown correctly when I start Firefox from a Slack link. I tried to use the same command line used by Slack to launch a link (which is just: firefox https://....), but that doesn't do the trick. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1828728 Title: White corners when CSD is enabled on Firefox To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1828728/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs