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Firefox will not open and states that its already running. But is not?

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After several opening and closing of Firefox several time it will not open when I click on the desk top icon. A screen will come up that Firefox is already running and that I will have to close it before I can start Firefox. To correct this I have to restart the computer. It will then work ok for a few time but will then not start again.

After several opening and closing of Firefox several time it will not open when I click on the desk top icon. A screen will come up that Firefox is already running and that I will have to close it before I can start Firefox. To correct this I have to restart the computer. It will then work ok for a few time but will then not start again.

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See "Hang at exit":

See "Firefox hangs when you quit it":

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