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I cannot re-open Firefox, or open another window, without rebooting

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I get a message indicating that Firefox is already operating and to either close the program or reboot. I cannot access the supposedly open program, nor can I open another window. I am using Windows 7. The problem repeats itself even after rebooting.

I get a message indicating that Firefox is already operating and to either close the program or reboot. I cannot access the supposedly open program, nor can I open another window. I am using Windows 7. The problem repeats itself even after rebooting.

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