When I try to open firefox, it says that a session is already running and I need to close it before I can run another session, I cannot find the session that's running, what can I do?

This happens after I have used firefox and exited the program. When I try to reuse the program I get this message. Is there a setting within firefox causing this or ??? I have tried to locate the session running without any luck. Would appreciate any help. I have uninstalled the program and then reinstalled it, but nothing has changed it continues to malfunction.

See "Hang at exit":
* http://kb.mozillazine.org/Firefox_hangs
* [[Firefox hangs]]

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