Update 11-8-20: Does not work often. Be sure that you have enabled it in private browser or for sure your ip will be outed. Mozilla has some settings in about config-google it to disable webrtc. Better to do that also because there are a lot of complaints that these addons are not reliable. Be sure to test it on more than one webrtc tester online to make sure they are not outing your home ip.
required by hoxx vpn to prevent webrtc leaks. problem is voxx does not tell u this in advance. It's a Cr*p vpn anyways since you have zero privacy and they mine/distribute your surfing profiles and use google analytics. also other online checks so no rtc leaks, yet hoxx says you have to have this to prevent leaks, which other users report having with hoxx vpn. Also had hoxx d/c without warning exposing my home ip and would not have known it if I had not done a manual ip check.