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If I close Firefox, I can't open it again without rebooting. It says that Firefox is still running.

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I have Firefox 6.0.1. I am running it on a desktop with Windows XP. I have always loved it and need it for one program I use a lot. Lately, if I close Firefox for any reason, I can't open it back up without rebooting. It says Firefox is still running. I have deleted Firefox and reinstalled it several times with the same result.

I have Firefox 6.0.1. I am running it on a desktop with Windows XP. I have always loved it and need it for one program I use a lot. Lately, if I close Firefox for any reason, I can't open it back up without rebooting. It says Firefox is still running. I have deleted Firefox and reinstalled it several times with the same result.

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