If you are looking for safer ways to manage or discover connections, consider these modern alternatives: Re: Facebook Friends Mapper Extension Download For Android
The long answer: While the concept of a friend mapper is fascinating, the modern reality is that no secure, fully functional extension exists for public download. The few remaining versions are either broken, dangerous, or require impossible permissions.
Once installed, the extension scans your Facebook friends’ location data (from profiles you can already see) and plots them on a world map. You can: