If the problem is just the window decorations then this is an Xwayland bug (source package 'xorg-server').
But I can't tell right now if parts of Firefox itself are also missing. And either way, the problem could be triggered by Firefox itself. ** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu) ** Also affects: firefox (Ubuntu) Importance: Undecided Status: New ** Tags added: xrandr-scaling -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1902921 Title: Scaling one monitor (to 1.5x in my case) can cause Firefox to lose window features (titlebar, buttons, bookmark bar) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1902921/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs