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Can not close Firefox properly and won't open again.

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Allen & Gail Martin
Allen & Gail Martin
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I'm getting the 'Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window' message. I've gone to the task manager and end tasks. Then try to delete parent.lock in Firefox profiles in appdata. Then I get this message... The action can't be completed because the file is open in Firefox. Can you please help me with this problem.

I'm getting the 'Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window' message. I've gone to the task manager and end tasks. Then try to delete parent.lock in Firefox profiles in appdata. Then I get this message... The action can't be completed because the file is open in Firefox. Can you please help me with this problem.

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