I just upgraded to FF 4, and I noticed that I no longer get google results (or google ‘i feel lucky’ results) when I type something in my address bar that isn’t a full web address.  Like I might type just sluggy and that would go straight to sluggy.com.  I basically use my address bar as an extra search bar, and have forever, so it’s a hard habit to break.

But it’s an easy fix to get it back to that functionality.

Just type about:config in your address bar.

It will give you an ‘are you sure’ warning.  Say you are sure.

Then find Keyword.URL, and double click on it.

Set it to http://www.google.com/search?ie=UTF-8&oe=utf-8&q=

if you just want it to return google results.

Set it to

http://www.google.com/search?btnI=I%27m+Feeling+Lucky&ie=UTF-8&oe=UTF-8&q=

if you want it to try to go to the most likely site.

More here: http://kb.mozillazine.org/Keyword.URL