Run two versions of Firefox on Mac OSX
Yesterday Firefox 4.0 was released and web developers everywhere celebrated a really great browser. The browser comes packed with a super fast JavaScript engine called JägerMonkey. Now don't get too excited just yet! We still need to keep that old version of Firefox around for testing; we can't assume everyone has upgraded to Firefox 4. So, to run both Firefox 3.6 and Firefox 4.0 on the same machine, just follow these simple steps:
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Open up your Applications folder and find your old version of Firefox
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Right click-> get info.
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Rename to "Firefox36.app"
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Download Firefox 4.0 and install as normal
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Celebrate that you now have 1 more browser to test in!
Really simple! If someone knows how to do this on the Windows and Linux side, I would love to hear how.
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