[Mac only] Are you eager to try out the latest Firefox 3 beta but not ready to give up on your Firefox 2 yet? Normally when a new version of Firefox gets installed, it’ll replace the current version in the machine and it practically makes reverting a tedious task. Here’s how you can get a taste of the latest Firefox 3 beta and still keep your Firefox 2 together with its profile settings and bookmarks working perfectly fine; in short, keeping 2 versions of Firefox in Mac.

Assuming you already have a Firefox 2 installed in your Mac:

1. Download latest Firefox 3 beta.
2. Double click to launch the installation dialog.
3. Drag the Firefox application to desktop (instead of Application folder)
4. Rename it to something else, Firefox-3-beta.app for instance.
5. Now drag the renamed Firefox 3 back into Application folder.

Double click on Firefox 3 and viola, it’s running with Firefox 2 safely untouched. To revert back to Firefox 2, just delete the Firefox 3 app.

via tech-recipes