As an alternative to having all of these windows open, you could use the Tab feature of the latest Mozilla builds. Mozilla seems to be slower than IE, but the tabs can keep all of your new browsers inside one window. (That's not really a good description, but when you see, you'll understand.) There's also a hack for IE that allows for the same type of tabbing. When I come up with what it's called, I'll edit this post.

Edit: It's called NetCaptor.