Safari does this, as does Chrome. For example, typing "webex" will show this discussion as one of the autocompletion suggestions.
Safari will suggest also suggest things like Wikipedia articles and popular sites. Similarly, if I type "imdb michael mann", Safari will suggest "Search imdb.com for michael mann".
Firefox's location bar is arguably much worse than both Safari and Chrome — it won't really autocomplete anything except "search Google for this" and bookmarks/history. Safari also leaves the search standing in the location bar when you submit it, whereas Firefox replaces it with an obscure, unreadable google.com URL.
Safari will suggest also suggest things like Wikipedia articles and popular sites. Similarly, if I type "imdb michael mann", Safari will suggest "Search imdb.com for michael mann".
Firefox's location bar is arguably much worse than both Safari and Chrome — it won't really autocomplete anything except "search Google for this" and bookmarks/history. Safari also leaves the search standing in the location bar when you submit it, whereas Firefox replaces it with an obscure, unreadable google.com URL.