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WHEN I TRY TO RUN FIREFOX IT SAYS AL;READY RUNNING IN BACKGROUND AND DOES NOT LOAD, HOW TO OVERCOME THIS ERROR

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Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system.

Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system.

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