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Firefox 4 has made my computer slower and it freezes. How do I get back to Firefox 3 or fix this

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My computer has gotten noticeably slower since upgrading to Firefox 4. It also freezes, sometimes for minutes. Is there a fix or if not, how do I get back to the previous Firefox. I have been with you for years and I'm about to say goodbye.

My computer has gotten noticeably slower since upgrading to Firefox 4. It also freezes, sometimes for minutes. Is there a fix or if not, how do I get back to the previous Firefox. I have been with you for years and I'm about to say goodbye.

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