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Sometimes when I close Firefox, disconnect internet connection then later in the day reconnect and try to reopen Firefox it tells me that Firefox is running and I need to close it or restart my system. Why?

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This does not happen every time. It also appears that if I use the File drop down menu and click on exit, instead of clicking on the "x" it does not happen.

This does not happen every time. It also appears that if I use the File drop down menu and click on exit, instead of clicking on the "x" it does not happen.

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