Firefox (Score 1)

I was using Netscape till Version 4. Then I switched to IE and was using it till the middle of last year, when I found Firefox. So now it's Firefox 99% of the time. Even when I was using IE, I faithfully downloaded all new versions of Netscape till version 7. When even that version did a poor job of rendering wepages with css (in my opinion), I gave it up altogether.