[Bug 109943]

[W-alessandro]

This slipped between other bugs, thanks for the ping.

I'm not sure there's anything else to do here as I can't reproduce this issue anymore.
Tested on 91.5.1 and on my mac the usage remains around 5% without spiking anymore.
Also, if I'm not wrong, this is not a XUL element anymore but it's not a standard HTML progressbar.

Can anyone else still reproduce it?

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https://bugs.launchpad.net/bugs/109943

Title:
  Thunderbird: high CPU usage from progress bars

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