As FreeDuck says, you can have as many browsers as you please - however, generally one will be your default browser, the others available on-demand, launched as you want them. Another note, apart from system resource issues, there should be no real problem having more than one browser-type open, provided your machine has a relatively fast processor and plenty of RAM; I sometimes have IE, FF, and Opera or some other browser running simultaneously, doing different things in the various browsers. I do this (if you gotta ask, mostly just 'cause I can
) on a variety of PIII, Centrino, P4, Athlon, and Mac machines, with RAM varying from 384MB to 2GB, noticing some, but not much, performance difference among them in normal browsing. Of course, user confusion is a real possibilty -