If you're one of the many people that are tired of the memory leaks and sluggishness of Firefox 2, you may have already started using the beta version of Firefox 3.
But there's an easier way: Nightly Tester Tools. Nightly Tester Tools is an add-on designed for users running beta/nightly releases of Firefox. Most of its features mean nothing to me right now, the important one is the ability to override the version restrictions for add-ons. So far I've been able to reinstall all my old add-ons without any problems, and without any hassle.