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Cannot open Firefox

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I cannot open Firefox. Error message appears: "Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window."

Task Manager always shows three active Firefox Apps, but ending those tasks does not help. I don't see any other active Mozilla procces on the list

I have uninstalled and reinstalled Firefox from MS Store but that does not help either.

I cannot open Firefox. Error message appears: "Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window." Task Manager always shows three active Firefox Apps, but ending those tasks does not help. I don't see any other active Mozilla procces on the list I have uninstalled and reinstalled Firefox from MS Store but that does not help either.

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