Hi,
These new features are useful if you happen to use several browsers at the same time ;-).
They are bound to shortcuts by default:
ctrl-1: close top window
ctrl-2: open window menu
ctrl-3: maximize/unmaximize window
ctrl-4: minimize window
ctrl-6: find window menu
ctrl-7: "exposé" for the current "application" (ie all windows of the same type)
ctrl-8: "exposé" for all windows
ctrl-9: previous window
ctrl-0: next window
Enjoy,
Romain