I have a random memory of the website at hanson.com having a banner alerting visitors that the website of the popular late-90s boy band was in fact at hansonline.com, and that you would only find information about guitars made by the Hanson company should you further browse the site at which you currently found yourself.

Curiously, that domain now redirects to some concrete company, Hanson guitars existing instead at hanson-guitars.com.

Browsers also tried to autocomplete <word> as www.<word>.com (and .net and .org, iirc) and send you there if it resolved. At some point they switched to sending you to search engines instead, but i bet there are flags somewhere in Firefox' bowels that will still do that for you if you really want.