firefox bug: quickly-disappearing lists and menus

 Firefox sometimes gets into a state where some lists and menus disappear after a fraction of a second.

This screencast video capture demonstrates it:


It happens with right-click context menus.  And it happens with drop-downs in web forms.  Not all of them, but many of them.

The video above demonstrates both context menus and form drop-downs.  I had to capture at 60 fps or the effect was too fast to get captured, at least for the drop-downs.  On playback in this blog page, I see that only some clicks are visible.  In the demo, I did 3 on the dropdown, then 3 context menus.  These were all visible on the original captured video.  I don't know if some became invisible due to a playback artefact, or because of blogger video processing.  But at least 1 of each type is still visible to me on playback within the blog post.

Uploading the (lossless) video to youtube [0] resulted in horrific compression, and the visible glitches being 0 on the dropdown and 2 on the context menus, again from the 3 + 3 on the original.

[0] https://youtu.be/T8b6ko7Uj9w

The workaround is to reboot the computer.

The above was captured on Debian 10.  I think I've seen it on Fedora, too.

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