Firefox is already running, but not responding to open a new window
I closed the only opened Firefox process that was running. Then clicked the Fox to start Firefox again. I received a message: Firefox is already running, but not responding, to open a new window. You must close the existing Firefox process, or restart your system. This is a stupid message since there is no Firefox in process.
This happened
Not sure how often
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Hello Lara.
Hopefully this support article is what you need:
http://support.mozilla.com/en-US/kb/Firefox+hangs#Hang_at_exit