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Download previous versions of FireFox

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I currently downloaded a new version of FireFox 3.6.17 however a program I use for work on FireFox does not work with this version and I need to find a downloadable version of 3.6.16 for MAC. Does anyone know where I can find this.

I currently downloaded a new version of FireFox 3.6.17 however a program I use for work on FireFox does not work with this version and I need to find a downloadable version of 3.6.16 for MAC. Does anyone know where I can find this.

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You can find all the releases on the Mozilla FTP server:

For example, 3.6.16 for MacOS in U.S. English: ftp://ftp.mozilla.org/pub/mozilla.org/firefox/releases/3.6.16/mac/en-US/

(Navigate around for other versions.)