[Bug 1940417]

[Stransky]

Please test with latest nightly, how-to is here:
https://fedoraproject.org/wiki/How_to_debug_Firefox_problems?rd=Bug_info_Firefox#Testing_Mozilla_binaries

You should create a new profile so it won't break your working Firefox
setup.

Alternatively you can use mozregression tool:
https://fedoraproject.org/wiki/How_to_debug_Firefox_problems?rd=Bug_info_Firefox#Use_Mozregression_tool

as:

MOZ_ENABLE_WAYLAND=1 mozregression --good 91.0

and it will download and launch nightly for you but you need to check
which version is actually running (mozregression will download and
launch Firefox 91, Nightly and versions between these two).

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

Title:
  On Wayland toolbar menus are sometimes invisible/flickering

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