I've been using Firefox since like version 1.5 and never found a reason to switch off of it. I have Chrome as a backup for shit sites that refuse to work in anything else, but that's all it gets used for.
edit: It's also the only browser I tend to recommend to people and has been that whole time as well.
You actually need Zen+, the 1000 series Zen CPUs aren't compatible but the 2000+ series are!