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won't open sites

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Firefox stops working. When I close Firefox, and try to reopen I get this 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.

There is no Foxfire window to close. The only way I am able to get Firefox up and running it to shut down the computer, and the process starts all over again.

Firefox stops working. When I close Firefox, and try to reopen I get this 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. There is no Foxfire window to close. The only way I am able to get Firefox up and running it to shut down the computer, and the process starts all over again.

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