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getting messageFirefox 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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When I try and open Firefox I get message

"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".I cant find firefox running in task manager and a restart doesn't change anything

When I try and open Firefox I get message "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".I cant find firefox running in task manager and a restart doesn't change anything