Am I the only one that does not understand why Firefox still has a 'Google search' field at the left? Why not use Chrome's approach and merge the two of them - at least give me the possibility to hide it. (And I am aware of the possibility so search in other sites than google, but I 'never' want to do that.)
a) I can drop-down the list of available search engines and see what's available, without having to remember any key-words to do the searches.
b) (and this is the killer feature for me) If a particular search engine is selected (say, IMDB), I can right-click on any word on a page, and one of the context menu options is "Search IMDB for ..."
Also, horizontal real-estate is not much of a concern on a wide-screen monitor - how much of the URL would I really want to see..?