If I enable Account Settings: ```[X] Clean up ("Expunge") Inbox on Exit``` and ```[X] Clean up ("Expunge") Inbox on Exit``` I can confirm the behavior. Here the pause is even ~80 seconds long (just one IMAP account).
Bug 1810041 Comment 3 Edit History
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If I enable Account Settings: ```[X] Clean up ("Expunge") Inbox on Exit``` and ```[X] Empty trash on exit``` I can confirm the behavior. Here the pause is even ~80 seconds long (just one IMAP account). If I turn them off again, TB immediately shuts down.