If anyone pays attention to my sidebar on this blog, you might notice that my link to firefox is gone and is now replaced with an Opera button. This is for good reason.
Since the release of Firefox 2, it seems that the browser has become a lot more unstable and even more resource intensive. On a technical note, I think a lot of this has to do with the way firefox is interacting with flash. Either way, it just isn't a pleasant experience on either my Mac or any Windows machine I use. I had been using Opera Mini on my cell phone for a while and had been REALLY impressed with it so I figured I'd give the regular Opera browser a shot and I am really glad that I did. It really seems that I'm not alone either. I'd suggest giving it a shot and let me know if it works for you and how you like it. It's definately built with more security in mind and it's a lot easier to maintain.
If you have a smart phone, give Opera Mini a shot as well.