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firefox error message:: Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window. :: I have used the task manager to end it ; I have deleted it and re downloaded it; what shall I do next?

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

what is the fix for this ; I have closed it with task manager. I have deleted it and reinstalled it. same error message. what shall I do next?

Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window. what is the fix for this ; I have closed it with task manager. I have deleted it and reinstalled it. same error message. what shall I do next?

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