WebKit (Safari) finally gets a DOM Inspector
One of the biggest reasons I used Firefox almost exclusively before going back to school was the DOM Inspector - I spent a lot of time dealing with DOM/CSS issues in Plone sites and the DOM Inspector was the best tool to debug / explore DOM situations. Now that I'm not doing web work regularly, and especially since Tiger came out, I've been using Safari. The odd time I found myself doing some Plone stuff I'd whip out Firefox. I'm sure I'll still need Firefox to test compatibility, but now I'll also be able to do the heavy lifting in Safari.