The weird thing for me is I'm on Firefox on my Mac and I ran all those tests and it said WebRTC is enabled, but never gave my actual factual IP address. I'm running Private Internet Access which they claim is vulnerable... So I'm not sure whose doing that test but they might have their settings a bit jacked up? If you have Private Internet Access there is an "Advanced Settings" panel where you can click on "IPv6 leak protection" it disabled IPv6 while using the VPN, seems to have been enough to fool these leak tests.