It's official: I am switching to Firefox 3 RC1 as my primary web browser. All of the extensions I use are now compatible in some form or another (Firebug and Linkification are still in 'beta'), so that's no longer holding me back.

One interesting note about Firebug. The new version has removed the 'Disable / Enable' feature for individual sites. Or so I thought. This functionality has now been moved to the Network Monitor and Script Debugger sections of the extension. In other words, I can now explore the DOM tree for any site, without having to pay the performance hit from the network monitoring code. Woo-hoo!