If you're willing to risk instability, a simple preference hack can bring out-of-date browser extensions back to life. If you're like me, you've been playing around with the beta releases of Firefox 3.0. The new version of the open source browser is better-looking, uses less memory, and feels snappier all around. There's just one problem: Every time they release a new beta version, some of your extensions and add-ons are bound to stop working. With the release of Firefox 3.0rc1, almost none of them work.