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Is it possible to run FF3.x and FF4RC side by side?

Selenium is not compatible with FF4 and Firebug has some issues. I want to go back to FF3.6 but was wondering it is possible to run both 3.6 and 4 at the same time.

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Two words: You don’t. –  kinokijuf Feb 11 '12 at 19:02
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marked as duplicate by Sathya Mar 29 '11 at 15:18

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Install firefox 3.6 after firefox 4 , and if you are still having issues install it on another drive

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Why not? Just simply use two profiles, or a portable Firefox 3, installed Firefox 4. Vica versa, portable Firefox 4 and installed Firefox 3.

The only thing that firefox can't stand is using the same profile.

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