Yep. And it works with FF 3. It's so useful. You get a tiny little icon in the bottom right of the screen with the FF logo, and if you click it it changes to the IE logo and rerenders the page using IE. The right-click menus and everything change. You can also right-click on links and tell it to open it in an IE tab, and if you go to Windows Update in FF, it automatically switches over to the IE rendering.
