I tried a new test and it works just fine.
I turned on my Opera VPN and then I opened up Ublock Origan Extension and activated
Prevent WebRTC from leaking local IP addresses.
So then I went to Whats is my IP Address and it did Not show my ISP or my location, but instead it said my ISP was Opera Mini Proxy and it showed me the location in Europe somewhere, So I looked into the IP and it shows me Services: Network sharing device or Proxy Server Type Wireless Broadband with Static IP Assignment. Therefore, it tells me I'm connected to Opera VPN via my Computer, and that WebRTC is not leaking my IP of my Real location.
Hope this info helps