(In reply to Niklas Hambüchen from comment #65)
> I have already tested that.
> 
> * Only throbber: ~15-20% CPU usage
> * Only progress bar: ~15-20% CPU usage
> * Both throbber and progress bar: ~15-20% CPU usage
> * Both disabled: no CPU usage

Strange that both together use the same CPU like when only one is
active.

Please could you try 
```
.tab-throbber[busy] {
  list-style-image: none !important;
}
```
Then I can see if the animated PNG is the cause of the CPU usage.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to thunderbird in Ubuntu.
https://bugs.launchpad.net/bugs/109943

Title:
  Thunderbird: high CPU usage from progress bars

Status in Mozilla Thunderbird:
  Confirmed
Status in thunderbird package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: mozilla-thunderbird

  When sending a simple and short email with Thunderbird via SMTP the
  CPU is used intensively. This seems not to be necessary. If the
  sending failed and an corresponding error message dialog appears, the
  CPU is still being used. When pressing ok to close the error dialog
  the CPU is fine. This suggests it might be related specifically to the
  progress bar.  Such behavior is especially annoying on a laptop where
  you can hear the CPU usage because of a starting fan.

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