[Bug 711305]

[Lohner-x]

I can confirm this bug with tb 17.0.2+build1-0ubuntu0.12.10.1

Not sure when it started happening (after upgrade from 16? due to some
extension installation / activation?), but I can never close tbird any
more. a "killall thunderbird" does the trick.

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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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