How can I run two different versions of Firefox, the latest does not work with an important site I need to use?

With the latest version of Firefox I cannot send "Quick Mails" to my students using the college's ANGEL system. I had to uninstall it and go to an earlier version. I prefer the newest rev.
Any way to run two different versions. It does not have to be simultaniously. Seems to be a problem on both my Mac and XP systems.
Thanks,
Kim

Currently I don't think there is a way to run two version of firefox at the same time. But you can install Firefox Beta or Aurora instead (which is build for future release for firefox) and help test it! Here's the link:
http://www.mozilla.org/en-US/firefox/channel/

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