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How do you install earlier versions of Firefox, specifically 1.5 or 2.0?

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I need Firefox 1.5 or 2.0 because it is the only version compatible with what I need but it will only let me install the latest version. How do I install earlier versions?

I need Firefox 1.5 or 2.0 because it is the only version compatible with what I need but it will only let me install the latest version. How do I install earlier versions?

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Such action is not usually recomended, what is it that you need compatability with ?

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On A Mac you can only install one Firefox version at the time.

So if you really need an older version then try the portable version: