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Firefox 4.0.1 is not opening after I close it. I get a box saying it is already running, but when I start task manager, it is not running. This has only started since I downloaded the new version. (4.0.1)

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Firefox 4.0.1 is not opening after I close it. I get a box saying it is already running, but when I start task manager, it is not running. This has only started since I downloaded the new version. (4.0.1)

Firefox 4.0.1 is not opening after I close it. I get a box saying it is already running, but when I start task manager, it is not running. This has only started since I downloaded the new version. (4.0.1)

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