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I downloaded firefox 4 but want to go back to the one before 4, how do I do this?

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My Norton toolbar will not work with Firefox 4 and until they update the Norton tool bar I need to go back to the old version of Firefox. How do I do that?!?!

My Norton toolbar will not work with Firefox 4 and until they update the Norton tool bar I need to go back to the old version of Firefox. How do I do that?!?!

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