Does what it says on the tin & does it well.

I tested and it DID work here! Does what it advertises!

泄露隐私
不信自己去https://ip8.com/webrtc-test自己测测

doesn't work. It itself says that your IP is showing, but nothing happens on clicking on it to Turn On. They have not given any setting in options to make it on or off. Seems it is dead.

Doesn't work

doesn't keep settings. shuts off by itself so your ip is revealed. Don't count on this for protection. and if you do use it check it each time to make sure it's turned on and working.