Description of problem: With the LastPass add-on installed, when clicking on the LastPass icon, most of the time (~98%) the drop down menu shows seems to "flicker" and display as a blank rectangle. This problem does not occur on firefox-x11 Version-Release number of selected component (if applicable): firefox-70.0-1.fc31.x86_64 Lastpass 4.36.0.1 How reproducible: Nearly always when Firefox is run with the Wayland backend. Never when run with the X11 backend. Steps to Reproduce: 1. Run Firefox with "MOZ_DISABLE_WAYLAND=0" 2. Install Lastpass add-on 3. Click on Lastpass icon to get drop-down menu Actual results: Possible "flicker" then white rectangle. Expected results: Drop down menu with text. Additional info: As said, this does not occur when Firefox is run with the X11 backend (MOZ_DISABLE_WAYLAND=1). For some reason this only seems to affect the Lastpass add-on. Others (e.g. uBlock Origin, Privacy Badger, FoxyProxy, ColorZilla) do not have this problem. Still, the fact that this happens on Wayland, but not on XWayland makes me think it's not so much a bug in the add-on.
Jan, can you look at it please? Thanks.
Upstream bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1585918
*** Bug 1766818 has been marked as a duplicate of this bug. ***
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