This style removes some of the unnecessary stuff in the address bar and hides/combines address bar buttons when not in use, and leaves you with more usable space to see and type web addresses, and add tabs, as well as for browsing

First, a summary of what this style actually does:
*Combines the stop and reload buttons
*Hides back and forward buttons when unnecessary
*Removes the go, identity, star, and feed buttons
*Hides sub-menus