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Firefox frequently refuses to close, each time forcing me to reboot. What can I do to correct this?

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This happens two or three times a session on line, after I have closed a program and seek to open a different one. I receive error messages advising me that Firefox is still running and that I must either close it out or restart my computer.

This happens two or three times a session on line, after I have closed a program and seek to open a different one. I receive error messages advising me that Firefox is still running and that I must either close it out or restart my computer.

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You can check out the Hang at exit portion of Firefox Hangs and see if any of those things apply in your case.