I was very annoyed that since I installed Yahoo Widgets (and removed it later on, since it was slowing down my PC too much) my address bar in Firefox was messed up: If i did not enter a proper URL, e.g. thanks to one of my many typemismatches, Yahoo search came up.. I did not want that. Now i finally found (via taragna’s blog) that i can change te behavior of the URL bar via about:config, filter on “keyword” and e.g. fill in “http://www.google.com/search?btnI=I%27m+Feeling+Lucky&q=. Thanks!