Ok, I changed the setting, closed firefox, restarted it, went to browserspy and it says the geo-location is enabled and shows a map to my house. (I have noscript disabled for this page, but I did not get a pop-up from firefox saying anything about giving away my location!)
Correction: The page shows my approximate location based in IP address. But it is VERY close! Also, it reports that my browser supports geo-location.