When using a proxy server, make sure the local WebRTC IP Address isn't leaked

[mdmintz]

When using a proxy server, make sure the local WebRTC IP Address isn't leaked

Currently, you can have a regular IP Address and a WebRTC IP Address.

Testable here: https://browserleaks.com/webrtc

This will solve it: https://stackoverflow.com/q/65705775/7058266

First make sure that hiding the WebRTC IP Address doesn't cause problems for existing tests using proxy servers, UC Mode, etc.

[mdmintz]

This was resolved in 4.20.8 - https://github.com/seleniumbase/SeleniumBase/releases/tag/v4.20.8