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can't open firefox due to another version running

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when I start firefox, it tells me the old one is running and to close it. i hit the close button and keep getting the same message. I have uninstalled firefox and reinstalled it and keep getting the same problem.

when I start firefox, it tells me the old one is running and to close it. i hit the close button and keep getting the same message. I have uninstalled firefox and reinstalled it and keep getting the same problem.

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this is the notice I get

Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window.

So I hit the close button and immediately get the same screen