Like with other products, the web browsers market is full with flame wars. Many people claim they use browser X, and that this is the best browser ever, and everyone should use it.
For me this is not the case. As a developer and a heavy user i use at least two different browsers every day. I cannot choose a winner when comparing them, and cannot give up on any. Both are a MUST for me.
I like Chrome because it is lightning fast, lightweight (loads in a sec), works perfectly smooth on a weak laptop (and its battery) and it is also safer (process isolation, less bugs) and more stable than any other browser. Most of my web surfing is done on Chrome.
For me, Firefox isn't a fox, but rather a horse. It carries the real heavy load of my web development. Tons of mature web extensions makes my life much easier when developing stuff. Examples for useful extensions would be FireBug and SwitchProxy. Also, I love the directions this browser is headed to.
For me, this richness of those two browsers is great, and I'd love to keep using them both, without having to choose a winner.