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When I try to delete Firefox to solve my earlier problem, it says to close Firefox before it can be deleted (but it's not open). Can it be running in the background?

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Cannot open, cannot delete Firefox as I am trying to download and run a newer version.

Cannot open, cannot delete Firefox as I am trying to download and run a newer version.

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Yes it can be running in the background. Open the Windows Task Manager > Process tab and look for firefox.exe and use End Process on it. Or reboot Windows, that should kill a "hung" process.