Thanks for the feedback Pierre. Marking the bug invalid as the correct combination of settings makes it go away.
Hardware acceleration + no compositing is probably not a supported configuration. ** Changed in: firefox (Ubuntu) Status: Incomplete => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1799793 Title: Developer tools menu has a black background To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1799793/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs