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I need to download and run firefox 4 or 3 for a certain web interface. How do I get from 5 (current download) to an older version?

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How do I go back to an older version of Firefox in order to accurately run a needed website

How do I go back to an older version of Firefox in order to accurately run a needed website

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Install the Portable Firefox 3.6.x version on your hard drive for accessing that website. It won't affect the current version you have installed.
http://portableapps.com/apps/internet/firefox_portable/localization#legacy36

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You're welcome.

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