good extension but I had conflicts issues with Mullvad VPN check status site if I use it in combination with the "disable webRTC" add-on:
https://am.i.mullvad.net/
it lost time for Checking for WebRTC leaks and then it shown "Failed checking for WebRTC leaks."
https://mullvad.net/en/guides/webrtc/
https://addons.mozilla.org/en-US/firefox/addon/happy-bonobo-disable-webrtc/
