[Bug 1780790]

[Enno]

I have a similar issue, in my case with the Bookmark bar's folders and
the system menu. I also cannot reproduce this at will, but today it
happened consistently enough to make a short recording. I'm on Pop_OS
(System76's flavor of Ubuntu 19.04) with the default Gnome Desktop,
Firefox 70.0.1 is installed from packages and maximized on the screen.

I have a recording, how and where can I upload that?

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https://bugs.launchpad.net/bugs/1780790

Title:
  Menus, tooltips and dropdowns are often misplaced on screen

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