Upgrading to Firefox 3 has been working out great so far. I do look forward to extensions such as AutoCopy updating soon, but otherwise I’m very pleased with the browser’s improvements. I’ve also been learning more about getting the most of Firefox 3, with this handy "Power User’s Guide":
"it’s time to dig deep and unearth the shortcuts, tweaks, and even Easter eggs that Mozilla marketing doesn’t mention. In honor of today’s official release of Firefox 3—at 10AM Pacific Time—let’s dive in past Firefox 3’s most talked-about feature-set into its lesser-known power uses, tricks, and customizations"