[Bug 711305]

[Ludovic-mozillamessaging]

Do you launch Thunderbird with the noremote option ?

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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.