As designers for the masses, we have to design for multiple browsers. I was just curious, what browsers do you have installed AND which do you instinctually click open first?

My ISP is AOL but I totally dislike the browser so I open and navigate in IE. But for the past month I've been giving Mozilla Firefox a try and I like it so far. The "open in new tab" is my fav feature. Although, I don't know where it stores the temporary internet files. Anyone know?