Google recently introduced a mode called "Browse By Name", a cross between "I'm Feeling Lucky" and a normal Google search. "Browse By Name" acts like "I'm Feeling Lucky" if Google is certain that the first hit is correct, but otherwise returns a normal set of search results. If you use Internet Explorer with the Google Toolbar, "Browse By Name" is the default behavior for non-URLs typed into the address bar. The Google Toolbar shows a dialog the first time you use the feature.
By default, Firefox uses "I'm Feeling Lucky" for non-URLs typed into its address bar. You can change the behavior by going to about:config and setting keyword.URL to the appropriate URL and then restarting Firefox.
|Address bar behavior||keyword.URL|
|I'm Feeling Lucky||http://www.google.com/search?ie=UTF-8&btnI=&q=|
|Browse By Name||http://www.google.com/search?ie=UTF-8&sourceid=navclient&gfns=1&q=|