Google's Location Aware Browsing
Websites that use location-aware browsing will ask where you are in order to bring you more relevant information, or to save you time while searching. Let’s say you’re looking for a pizza restaurant in your area. A website will be able to ask you to share your location so that simply searching for “pizza” will bring you the answers you need... no further information or extra typing required.
Or, if you’re mapping out directions to get somewhere, the website will know where you’re starting from so all you have to do is tell it where you want to go.
This service is totally optional – Firefox doesn’t share your location without your permission – and is done with the utmost respect for your privacy. And, like all elements of Firefox, it’s being created using open standards to ease adoption by Web developers.
How do I turn off Location-Aware Browsing permanently?
Location-Aware Browsing is always opt-in in Firefox. No location information is ever sent without your permission. If you wish to disable the feature completely, please follow this set of steps:
In the URL bar, type about:config
Type geo.enabled
Double click on the geo.enabled preference
Location-Aware Browsing is now disabled
Link: http://www.mozilla.com/en-US/firefox/geolocation/