Any software implementing STUN will do this. Listing all IPs is also done when using ICE, another method for NAT traversal. In my opinion, it's not really news;

Any software implementing STUN will do this. Listing all IPs is also done when using ICE, another method for NAT traversal. In my opinion, it's not really news; just a reminder that browsers have become monstrous pieces of software that include just about anything and the kitchen sink. This can be disabled, in firefox go to about:config and change the media.peerconnection.enabled key to false.