@WaltS48: I guess I found out why this wasn't reproducible: There are 2 
progress bars:
 * the one that is shown if the percentage of progress is known and
 * the one that is shown to indicate that an activity of unknown duration is in 
progress.
Only the latter one uses 100% of one CPU.

The drawback is: As soon as the network connection drops as you go
mobile thunderbird's next attempt to connect to a server is likely to
trigger the "activity of unknown duration" type progressbar - and to
rapidly drain the accumulator if the mobile device.

Perhaps the activity indicator that has the problem should be better
referenced to as "throbber" as a 2nd thought....

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

Title:
  Thunderbird: high CPU usage from progress bars

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