Bummer, urls typed in this window are not stored in the global drop down history. Use F2 if you just have to have a record of that typed url. Roger NASA, you are GO for liftoff . The Go button is used after typing in URL's or search engine searches. You can turn that puppy off from Prefs-Toolbars.
Zoom drop down.
Adjust the zoom factor of the window. Zoom in, zoom out, amaze your friends and influence colleagues with the deftness of your control. A button on the Window Bar . Each document you open in a new window is given a button on this bar. There is a right click menu on tap for the Window bar.