Use SeaMonkey! I've made the switch recently, after being a die-hard Firefox user since the beginning. I couldn't be happier. The interface is old-school, and it functions well enough for the simple work for which I use a browser. Just try the darned thing - you'll be very happy you did. If you're the kind of person (like me) that was seething with every release of new "features" in Firefox (awesomebar, et al.), give SeaMonkey a try.
It makes me very sad to say it, but I've moved on from Firefox, (and I don't like to touch Chrome or IE), but then again - the world seems to have moved-on from the ideal of clean code and efficient applications, as much as it has moved on from that old idea of language evolving logically from etymologically sound roots.
There's no stopping the tide, but there are indeed viable options. I highly recommend reading Paul Venezia's
post about quarantining services to specific browsers. It's not hard to do. Use Chrome for watching crud on Youtube or using any Google services, (and nothing else!), and block it on your usual browser with NoScript, etc. Use a different one for Facebook (if you use that gawdawful service), and block the scripts on your usual browser. It's a simple solution, but it probably helps mitigate tracking a tiny bit.
Can anyone provide any good reasons to not use SeaMonkey?