This is really too tiny to mention but I just ended up doing it 5x in a couple hours because of a multitude of oops.
- In firefox URL bar, enter about:config
If it tosses you a "zomg void warranty?" message, ignore it. - in Filter box type keyword.url
- Doubleclick on the Value field and replace what's there with http://www.google.com/search?q=
- Now when you type keywords into your url bar, it'll google it instead of tossing an error or taking you to the result of an "I'm feeling lucky" search.
This is based off of what I learned from someone else's blog, but I can't find the damn thing any more.