[Bug 1959747]

[Frank Winklmeier]

I am seeing the exactly same behavior as Adi on Ubuntu 22.04. I manually
upgraded to Thunderbird 102 via the mozilla ppa and I am seeing the same
high CPU usage on mouse hover and delayed animations, which made the UI
almost unusable for me. My first guess was also the WebRender as I had
to disable it for Thunderbird 91. However, I do use Firefox 105 without
problems. So maybe it is indeed a different issue.

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Title:
  [upstream] Very high CPU and slow responsiveness in Thunderbird 91

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