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The freeze occurred after update to 5.11, and prior updates. There are no freezes during normal operation (no updates).
Is there better way to report problems?

Это отзыв для предыдущей версии этого дополнения (5.11).  Этот пользователь ранее оставил 1 отзыв на это дополнение.

Yes there is - on the QuickFolders github:
https://github.com/RealRaven2000/QuickFolders/issues

When you report an issue like this, it is important to know which version of Thunderbird you are running. Thunderbird 102 made a change to servernames that can potentially invalidate all tabs in QF and it tries to repair these based on the previously stored account. Apart from that, 5.11 actually does a lot _less_ then the previous versions so it should run quite a bit faster than 5.10.3 especially on Thunderbird 102.

Edit: no need to leave 2 reviews, you can also reach out directly to me via the support tab in QuickFolders settings - I usually reply on the same day.