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i need to load an earlier version of firefox ie; 3.1 or 3.5 or 3.6 to access a certain site. how do i accomplish this?

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A certain site I need to connect to does not support firefox 4.0. I need an earlier version to access this site 3.1 , 3.5 or 3.6. How do I download and have it override my current 4.0 version?

A certain site I need to connect to does not support firefox 4.0. I need an earlier version to access this site 3.1 , 3.5 or 3.6. How do I download and have it override my current 4.0 version?

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Best to use an older version of Firefox Portable for accessing websites that need an older version of Firefox. It won't affect your current Firefox installation like reverting to an older "official" version would.

http://portableapps.com/apps/internet/firefox_portable/localization#legacy36

Scroll down that page for even older versions.