Please search the forums. There have been many previous requests for older versions of Mozilla.
http://www.oldversion.com/talk/index.php?a...2314&hl=mozilla
http://www.oldversion.com/talk/index.php?a...1797&hl=mozilla
http://www.oldversion.com/talk/index.php?a...&f=2&t=1064&hl=
http://www.oldversion.com/talk/index.php?a...T&f=3&t=934&hl=
Also see...
http://browsers.evolt.org/
ftp://ftp.mozilla.org/pub/mozilla.org/
http://archive.mozilla.org/pub/