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how do i get a older version

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i need both the 3.6 and 4.0 versions of firefox for a website testing and i cant seem to find them on your web site or anywhere

i need both the 3.6 and 4.0 versions of firefox for a website testing and i cant seem to find them on your web site or anywhere

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Version 3.6 is available here: http://www.mozilla.com/firefox/all-older

Version 4 is replaced by version 5 and isn't considered a supported version, but it's still available on the FTP server: ftp://ftp.mozilla.org/pub/mozilla.org/firefox/releases/