When i close firefox and want to use it later i get a warning saying cannot open firefox close it first this keeps happening all the time any ideas to solve this problem? i have 2 mchines one on xp and one on windows 7

i have 2 pcs one with xp and the other with windows 7 heres the problem
when i close firefox and say go back to it say in 10 mins i get a error message saying to close firefox before opening!!! but firefox window is closed but the processes still say its running in task manager so to correct this i have to end process on firefox. this seems to be happening now every time in the last few days i have upgraded firefox to the latest version. any ideas on how to solve this problem.

see if this helps you : [https://support.mozilla.org/en-US/kb/Firefox%20is%20already%20running%20but%20is%20not%20responding Firefox is already running but is not responding]
thank you
Please mark "Solved" the answer that really solve the problem, to help others with a similar problem.

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