I've used Recovery option, clean my PC of Firefox, restart, re-installed Firefox and got the same message " Firefox is already running, must be closed ".
Windows 10: FireFox
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New 18 Aug 2016 #11
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New 18 Aug 2016 #12
Done Recovery option ( from 10 days ago when the world was in order ) Restart/ Cleaned with CCleaner / Restart and re-install Firefox. Same problem.
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