I must be one of the few people who really don't care for Firefox. I don't like the way fonts look it in. And for designing websites, I much prefer IE. That's all I use unless it's absolutely necessary to use Firefox. Which 9 times out of 10, it's not necessary. I downloaded the new version, I really didn't see a whole lot of difference.
I think that is because since most computers come with IE, there is more focus on catering to the majority of people when creating online software. I love firefox but like you I find times when it is necessary to use another browser for functions especially coding.
"Nature holds the key to our aesthetic, intellectual, cognitive and even spiritual satisfaction." - E. O. Wilson