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I have Firefox 5, but need to downgrade to 3.5 or 3.6, how do I do this?

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I have Firefox 5, but need to downgrade to 3.5 or 3.6, how do I do this? Can you help me please? It is important to finish something I am working on.

I have Firefox 5, but need to downgrade to 3.5 or 3.6, how do I do this? Can you help me please? It is important to finish something I am working on.

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If you need that older version to access specific websites then you can install the portable Firefox 3.6.19 version to access websites that do not work with Firefox 5+.