Firefox redirects malformed address to microsoft.com

Anyone know why, when you specify the HTTP protocol twice in Firefox (put https://https:// into the address bar), it resolves to microsoft.com?

UPDATE: Mystery solved. Ricardo Vidal e-mailed me a couple of hours after I posted this to explain what was happening. When Firefox gets a malformed address it runs it through an I’m Feeling Lucky Google search, and, as you might have guessed, Microsoft is the first result for https://.