[Bug 109943]

[PeterPall]

52.6.0 (64-bit) on Ubuntu 18.04. On both gnome on Xorg and gnome on Wayland the progress bar uses 100% of one of my CPUs.
I know that if there is no other task a modern CPU tends to be in sleep mode most of the time (which makes the only task automatically reach 100%). But the progress bar also drains my battery in ca. 40 minutes and makes the CPU fan go haywire => it seems to be hideously inefficient.

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Title:
  Thunderbird: high CPU usage from progress bars

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