Firefox 3.5 is "location-aware"

How the hell does it know my nearby access points? I'm running it on Ubuntu. Sure, it's possible, but how does it have access to this information? Does it contain code to access every wifi-manager API in existence?

Is there a way for it not to guess my position? I happen to have a desktop computer that´s very hard to move.

The feature "display my position" is available in Google Maps. It is not when I use Safari 4.0.

Is anyone else getting funky results with this? It always returns 40.75, -73.997 (New York City) as my location, but I'm in Toronto.

Any resources on how to leverage this? Their FAQ offers no info for developers.