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firefox wont open it keeps saying it ia already running and to close it before opening a new window whatcan i do to remady this

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when ever i go to open fire fox i get a prombt saying firefox is already running and to please close it down are restart my pc before i can open it nothing is running and evehn after rebooting my pc i still get the same message i even reinstalled firefox and im still getting the same message

when ever i go to open fire fox i get a prombt saying firefox is already running and to please close it down are restart my pc before i can open it nothing is running and evehn after rebooting my pc i still get the same message i even reinstalled firefox and im still getting the same message

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Sounds like it is hanging when you exit and later try to restart Firefox.