Im blown away by the amount of people using Chrome and IE here. Its my understanding that Firefox is much less susceptible to attack. The fact that it also seems to be browser of choice for I.T professionals at least in my neck of the woods seems to confirm that as well.
I've used FireFox with AdBlockPlus and NoScript plug-ins since my wife and I were in S. Korea. The internet is awesome in Asia but at the same time isn't regulated for ads the way ours is...so ads and malware are prevalent. FireFox with those plug-ins takes a LOT of that out of the equation. The element inspector and page debugger is very handy as well.