I use Mozilla most of the time:
1. Except really crappy MS tricks it works with every site.
2. Even hotmail (wankeers).
3. You can get rid of most of the pop-ups, by just disabling such scripts.
4. You can set your middle-click for "open in a new Tab" and there you go no additional windows.
5. A main window with many tabs is faster than the same number of main windows. Besides, you can switch between the tabs while loading faster than switching between windows (cuz multi-tasking is handeled by mozilla rather than MS Windows)
6. Even skins are available with 1.0
I just use IE for visiting this site on Fridays