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• Thunderbird becomes unresponsive every few minutes for several minutes

  Deleted the ~/.thunderbird folder and set up everything again and the issues seem to be solved.

• Thunderbird becomes unresponsive every few minutes for several minutes

  Just removed the mail accounts and Addon and even then the UI is still laggy (e.g. when opening/closing the settings tab).

• Thunderbird becomes unresponsive every few minutes for several minutes

  A little more information: Thunderbird also takes about 5 minutes to start. Just installed it on macOS on a MacBook Pro (~2016) and it seems to work fine with the same Addon in…