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Why does Firefox periodically not shut down when the program is closed?

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Quite frequently Firefox does not shut down when the active window is closed. Attempts to open another program that uses Firefox is then blocked from opening until I shut down and reboot my computer as the drop down box instructs. I have tried everything I can, but none of the suggestions currently offered seem to apply to my problem. This has only been since the lat update to Firefox a little over a week ago. I am running Widows 7 with all current important or urgent updates (not including Internet Explore updates/upgrades).

Quite frequently Firefox does not shut down when the active window is closed. Attempts to open another program that uses Firefox is then blocked from opening until I shut down and reboot my computer as the drop down box instructs. I have tried everything I can, but none of the suggestions currently offered seem to apply to my problem. This has only been since the lat update to Firefox a little over a week ago. I am running Widows 7 with all current important or urgent updates (not including Internet Explore updates/upgrades).

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Use "Firefox > Exit" (Windows: Firefox/File > Exit; Mac: Firefox > Quit Firefox; Linux: Firefox/File > Quit) to close Firefox if you are currently doing that by clicking the close X on the Firefox title bar.

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