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How to reinstall firefox 3.6

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Unfortunately I installed Firefox 4.o to my Windows XP computer and later found out that it was incompatible with my virus software by McAfee. It runs poorly and very slowly.

Now I would like to reinstall an earlier version, like Firefox 3.6, which ran better with McAfee.

How would I do that installation?

Unfortunately I installed Firefox 4.o to my Windows XP computer and later found out that it was incompatible with my virus software by McAfee. It runs poorly and very slowly. Now I would like to reinstall an earlier version, like Firefox 3.6, which ran better with McAfee. How would I do that installation?

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Please see the solution given to the same question here-

http://support.mozilla.com/en-US/questions/824643?s=how+to+go+to+older+firefox&as=s