Huge Security Flaw Leaks VPN Users’ Real IP-Addresses. Whoah, no bueno. There is a fix for Firefox, open "about:config" in a new tab and search for media.peerconnection.enabled and double-click to set to false. There was also a forum post by Private Internet Access (my VPN provider of choice): How to Stop WebRTC Local IP Address Leaks on Google Chrome and Mozilla Firefox.