When I upgrade Firefox, I can't open it. But the windows say I areleady open it

well, when I click firefox that I upgrading, It won't open the window and windows say the firefox is running but I can't see the window

See:
* http://kb.mozillazine.org/Profile_in_use
* https://support.mozilla.com/kb/Firefox+is+already+running+but+is+not+responding
See also "Hang at exit":
*http://kb.mozillazine.org/Firefox_hangs
*https://support.mozilla.com/kb/Firefox+hangs

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