Note that you can use `//` prefix to mean `http://`. E.g. if you want to go to `http://foo`, you type `//foo` in the address bar. You can also use `//` URLs in HTML, it expands to `http://` or `https://` depending if the page is served via HTTP or HTTPS (this is cross-browser)

> On FF33, when I type in a one-word, no-TLD hostname in location bar, it takes me to my default search engine, while asking "Do you want to go to hostname?"

Do you mean after you press enter? I can't replicate your finding for words that are simply typed into the location bar.