Yep, you are right, FF 3.5 is being provided with location by the Google Location Service (http://google-code-updates.blogspot.com/2009/04/google-locat...). Also, this service implements http://dev.w3.org/geo/api/spec-source.html, which should, once widely adopted, void the need of a wrapper library such as geo.js posted here.

Edit: Typo