Given the impact on context menus, I'd say the issue is likely to be in the GTK widget layer. It would be interesting to know: * Are you running in an X11 or Wayland session (what does `echo $XDG_SESSION_TYPE` in a terminal say)? * If you're in a Wayland session, are you running Firefox in Wayland mode (check "Window Protocol" in `about:support`)
Bug 1803246 Comment 4 Edit History
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Given the impact on context menus, I'd say the issue is likely to be in the GTK widget layer. It would be interesting to know: * Are you running in an X11 or Wayland session (what does `echo $XDG_SESSION_TYPE` in a terminal say)? * If you're in a Wayland session, are you running Firefox in Wayland mode (check "Window Protocol" in `about:support`)?