MultiFirefox

Version: 2.0 || Release Date: 2008-06-19 || License: BSD License Developer: David Martorana | App Owner: delfuturo

Utility to run multiple versions of Firefox side by side.

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1 Opinion

Afaik, this can also be achieved via command line, as described here (middle of the page):
http://lifehacker.com/231646/geek-to-live--manage-multiple-firefox-profiles