I'm a total Firefox junkie, I don't even have any other browser installed (other than IE). Prior to switching to Firefox I used Mozilla. and every time a new Firefox version came out I'd download and try it out. I found the browser was getting better and better with each new version and at either version 0.7 or 0.8 I finally made the switch. That was sometime between six and seven years ago, and I'm still going. I totally love Firefox 4, it's incredibly fast and finally having a skin that integrates well with the Aero UI in newer versions of Windows is awesome. Since I'm so familiar with Firefox and the way it works I've just never considered using another browser.
Firefox it is for me, and Opera Mini when on my HTC Desire phone (aside from flash content on the Desire, I have to use the default browser for that).
UserAgent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b4) Gecko/20100818 Firefox/4.0b4


/Mozilla user. However, after 7.2 became outdated I moved on to SeaMonkey. When 
