Всё, что нужно есть в about:config:

media.peerconnection.enabled = false
media.peerconnection.turn.disable = true
media.peerconnection.use_document_iceservers = false
media.peerconnection.video.enabled = false
media.peerconnection.video.vp9_enabled = false
media.peerconnection.video.h264_enabled = false
media.peerconnection.identity.enabled = false
media.peerconnection.identity.timeout = 1

Ну и вообще смотреть по фильтру "media.peerconnection".

Yy

A

works fine!

works like it says..
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simple et efficace !

works exactly as described

отдично

Excellent,thank you!

goooood

love this app

Ok

Работает!
Смотрите сами: https://whoer.net/

Exactly does what it says it will do. Ends surreptitious circumvention of your VPN IP addresses.