Greasy Fork is available in English.
alerts whenever a WebRTC connection is made and shows its info in the js console
notifies you whenever you're on a page that creates an rtc (peer-to-peer) connection. you can then open the javascript console to view more detailed information about the connected ip address. only shows 1 popup alert per page, regardless of how many connections are made.
on most modern browsers, you can access the js console with:
shift+ctrl+jshift+cmd+j
