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WebRTC privacy-hardening settings

As noted in mullvad-browser#151 (closed), the most sensible preference changes to harden WebRTC privacy for our use cases seem to be:

  • media.peerconnection.ice.relay_only -> false
  • media.peerconnection.ice.default_address_only -> true
  • media.peerconnection.ice.proxy_only_if_behind_proxy -> true
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