Marco Trevisan submitted an upstream mutter merge request with a fix of this issue. I have applied it to the Ubuntu package through a PPA, installed the resulting binaries, and accomplished some tests:
* I can no longer reproduce the issue with a black window when opening Firefox in wayland, not even after having run "killall Xwayland". * This sequence: killall Xwayland; sleep 3; GDK_BACKEND=x11 gedit results in a normal gedit window as far as I can tell. * I also entered an x11 session, and also there I can open Firefox without issues. So I uploaded mutter to the lunar unapproved queue for consideration by the release team. ** Changed in: mutter (Ubuntu) Status: In Progress => Fix Committed -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1987976 Title: firefox black window on wayland To manage notifications about this bug go to: https://bugs.launchpad.net/firefox/+bug/1987976/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs