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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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Many thanks.

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You're welcome.

Please click the Solved It button next to the answer that answered or solved your Firefox support issue, it appears when you are logged in, so this thread gets marked as Solved to help other users who may have this same problem.