If you're not 100% converted to Safari, and still like Mozilla's feature set and its tabbed interface, here's a way to get even more out of those tabs. Tabbrowser Extensions greatly expand the capabilities of Mozilla (and Netscape) tabs. Installation is simply a matter of following the link on the web page and restarting Mozilla.
Once installed, you'll find your tabs have a wide array of new powers (there's an FAQ page on the site that explains much of what you can do). Instead of the four simple radio buttons in the tabbed browsing prefs area that you had before, you now have eight separate sections, each of which has numerous options! I'll be honest and admit that I haven't tried more than two or three of them at this point, but the power is there if you want to use it.
For me, the two biggest gains are that you can rearrange tabs by dragging them around (hooray!), and a customizable tab contextual menu that can include items such as auto-reload time (for your favorite news or sports page), duplicating the tab, disallowing JavaScript on the tab, and much much more.
There's even a one-button uninstaller if you don't like what you see. It's not quite perfect (the prefs dialogs have a spacing issue on my machine, and I have one problem with a form page that insists on trying to set the reload time), but there are enough nice productivity features to make it worth a minor glitch or two.
If you're hooked on tabbed browsing, Tabbrowser Extensions will do nothing to cure your addiction!
Mac OS X Hints
http://hints.macworld.com/article.php?story=20030206072346653