Where can I find really old versions of Firefox?

I am looking for an old version of Mozilla Firefox from before it was called Firefox.

It used to be called Mozilla Phoenix before it was ever called Mozilla Firebird.

I am looking for some of the oldest versions around (for Win32). Where can I find them?

Firefox Releases: Scroll down for older versions. Phoenix 0.1 is the oldest release available here.

Directory of Phoenix Releases: A download location for Phoenix 0.1 through 0.5.

For older versions of any browser you can go to browsers.evolt.org.

oldversion.com has older version for Firefox. Not sure it goes far enough for your needs.