This suggests the menu is an override-redirect X11 window, so perhaps appearing on all workspaces is 'correct' and it is a bug in Firefox.
Please also try logging into a Wayland session. ** Package changed: xorg (Ubuntu) => firefox (Ubuntu) ** Changed in: firefox (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/2056642 Title: drop down menu appears on another workspace To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/2056642/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp