Firefox, Safari, Camino. In that order.
The expandability and flexibility of Firefox over ANY browser out here makes it number 1 on my Macs. The widgets are hellishly ugly but with a few tweaks they can look pretty good and I posted a screenshot of it a few weeks back
. Iv've also made the tabs to look like Safari cuz I don't like what the original tabs look like.
Extensions: BBCode, Gmail notifier, Tab Clicking Options, Disable Targets for Downloads, Open Book, Sage, Super Drag and Go, TabSwitcher, Webmail Compose, Google Preview, Keyconfig. For, more extensions, go here
Firefox can undo anything you do in a text box so if I accidentally deleted a whole block of text, I can get them back, which puts it ahead of Safari any day. Also the search bar lets me add search engines so I can do quick searches on imdb, dictionary, amazon, and a whole bunch of other sites without opening the site first. Some of you may not care about it but it's a time saver and convenience.
The only thing that stumps Firefox is Flash. A flash file as small as regular a banner ad will cripple it almost completely. You won't be able to close or switch windows or tabs, no scroll, etc. The flash animation either doesn't run or runs very slowly but it runs fine if you hold the mouse button down. And then you force quit it. Try opening this page
in Mac Firefox 1.0 and see if it cripples it. It always does on mine.
This is why I keep Safari around cuz it handles flash much better. Somehow it's fine on Mozilla as well which is confusing cuz FF and Mozilla are practically the same. maybe it does certain event handlings differently. I don't use Mozilla cuz it's full of things I don't want, like the mail client and composer.
I keep Camino around just to see how the mac mozilla project goes. Unfortunately while it's come leaps and bounds since 0.7, it's still not mature enough for a primary browser, getting plenty of performance hits simply by opening more than 10 tabs. I imagine not many people would use Camino cuz it's practically the same as Safari, except it uses the Mozilla backbone while Safari is on Konqueror. Although flash is just as bad as in Firefox.