[Bug 366103]

[Heletjacq-graves]

I could reproduce this bug with a new Firefox installation and before the addition of of plug-in like AddBlock Plus.
It occurs randomly : somtimes Firefox close normally if it was opened through a link within a message, sometime not.
This bug appeared with the last update 25.0.1, I never saw it before the installation of this update.

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https://bugs.launchpad.net/bugs/366103

Title:
  Double-clicking Firefox launcher produces "Firefox is already running"
  error

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