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Foxfire will not "shut down" when I close it. When I try to reopen it, it gives an error: Foxfire is currently running.

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When I close Firefox, the application stops as usual. However, if within a couple of minutes (longer), I try to restart the application, it will not open. An error message appears stating the operation is open and must be closed before it can reopen. I must got into Task Master (Windows Vista-Home Premium) and end the process. The Application page is empty.

When I close Firefox, the application stops as usual. However, if within a couple of minutes (longer), I try to restart the application, it will not open. An error message appears stating the operation is open and must be closed before it can reopen. I must got into Task Master (Windows Vista-Home Premium) and end the process. The Application page is empty.

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See hang-at-exit in this support article.
https://support.mozilla.com/en-US/kb/Firefox%20hangs