i normally use firefox. but sadly there are a few things where you have to use IE. like, my online college courses. sadface. too many backdoors in IE for my liking; while i don't have those classes, i uninstall IE.
I uses FireFox but something happened and i couldnt put favorites and all favorites were deleted and i started using Maxthon
Opera is my primary browser, and I use Firefox as my secondary browser.. I hardly use IE (unless updating windows) and When using Knoppix (if in the event that windows stopped working) then I use Konqueror.
I usually use Firefox. But sometimes, for downloading, I will use IE. Firefox and Vista just don't get together for me.