[Expired for firefox (Ubuntu) because there has been no activity for 60
days.]
** Changed in: firefox (Ubuntu)
Status: Incomplete => Expired
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/205664
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 => I