I had something of a geek "moment" this evening when I installed Firebug (a Firefox Plugin) - this is just so freaking cool. Completely pointless unless you are a developer or someone very interested in what's going on inside your browser, but hey, I am one of those people. And if you are one of those people, this is a mind-opening paradigm-shifting bit of code.
(Via Jon Hicks - I am really in the same boat as this guy, Firefox is getting to be so cool, but the last little gaps in "Macness" drive me back to Safari sometimes. Where's my seamless .Mac/Safari bookmark sync?)