Change the search mode in the address field
By default, if you enter a search term in the address field and press Enter, a Google "I'm Feeling Lucky" search is performed, and you're taken to the first result of that search directly. If you prefer to see the standard search result list instead, use about
:config to change the value of the preference keyword.URL to
http://www.google.com/search?btnG=Google+Search&q=.
Of course, you could also change to a completely different search engine by changing the string to something else. The default search string is: "http://www.google.com/search?btnI=I%27m+Feeling+Lucky&q=".
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So basically what you have to do to restore the default behavior is enter "about
:config" in the Address Bar, scroll down to the preference "keyword.URL" and change the value to "http://www.google.com/search?btnI=I%27m+Feeling+Lucky&q="