[Bug 1940417]

[Gijskruitbosch+bugs]

Does the flickering happen on a mozilla.org (not distro) Firefox, with a
clean separate profile with no other changes (add-ons, prefs changed,
etc.)? See [this SUMO page](https://support.mozilla.org/kb/profile-
manager-create-remove-switch-firefox-profiles) for details on how to
create a separate profile.

If so, can you provide the graphics portion of the about:support section
of such a profile, please?

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https://bugs.launchpad.net/bugs/1940417

Title:
  On Wayland toolbar menus are sometimes invisible/flickering

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