[Bug 711305]

[Kerem B]

I have this problem in Ubuntu 22.04.1 LTS with Thunderbird 91.11.0 and
am shocked to see that this bug has persisted for 12 years.

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https://bugs.launchpad.net/bugs/711305

Title:
  Thunderbird is already running, but is not responding. To open a new
  window, you must first close the existing Thunderbird process, or
  restart your system. Error received when clicking a mailto link in
  firefox.

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