[Bug 711305]

[Amanita+bugzilla]

Okay tried it: created a new desktop entry linking to that script, in
KDE set it as Mail program, in Librewolf set mailto to "open with system
handler", still the exact same result

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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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