If you haven't tried Opera, I highly recommend you give it a spin. It's a great browser and it's worth using for regular browsing; even better than Firefox, in my opinion. Firefox's extensions still give it the edge for web development, but Opera is quite close. Here are my favorite features Opera has over Firefox:
A sexy default look. I think Opera generally looks much sleeker, and the smooth-scrolling is worlds better (parabolic instead of linear, I think). It's a tiny aesthetic change that makes a big difference in ease of use (I don't lose my place) and feel of the app.
Speed dial. You've got your top nine right there in front of you.
The Wand. It's a huge time-saver if you have multiple logins for a site. Just click the username you need to use, and Opera submits the form with the creds you picked. It's faster and less clunky than the dropdown that Firefox uses.
The Trash bin. It lets you pick any recently closed page; you don't have to Ctrl-Shift-T through all the tabs you just closed to find the right one.
Quick search. Firefox has inline search too, but Opera simultaneously highlights *all* occurrences of the search text as you type.
And finally...
Dragonfly, the Opera javascript debugger. This baby is impressive. It's much easier to use than Venkman and rivals Firebug. The script window lets you pick any loaded script (inline scripts have their own entry!). The DOM tab (which is less spastic than Firebug's) lets you inspect all of your elements in folding-tree style. The Styles pane with then show you the explicit and computed styles on the element. Fantastic.
So give Opera a try. You might find a thing or three that you like.