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

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.

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+.
*http://portableapps.com/apps/internet/firefox_portable#legacy
*http://portableapps.com/apps/internet/firefox_portable/localization#legacy36
*Firefox 3.6.x: http://www.mozilla.com/en-US/firefox/all-older.html

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