The third party plugin adds a Foursquare toolbar to your browser that lets you add venues, check-in to Foursquare (and simultaneously ping Twitter and Facebook), view venue details, locate active friends on a map and take advantage of every other Foursquare functionality the service supports.
What's especially great about Foursquarefox is that the entire experience feels like an extension of the application, so processes like checking in and adding shouts are familiar and look fantastic.
Foursquarefox nicely complements the mobile application experience. The ability to check-in from a browser using Firefox location services and the quick access to maps to locate places and friends make it especially easy to see who and what is just around the corner. Perhaps it's time to start planning your next check-in adventure around town.
