Is there a pref to turn this added functionality off?  That way users who
are worried about their fingerprint can change the about:config pref?  Or
perhaps it can be disabled when privacy.resistFingerprinting is set to true?

Thanks!

~Tanvi

On Tue, Dec 5, 2017 at 9:19 PM, Nico Grunbaum <ngrunb...@mozilla.com> wrote:

> Background: RTCRtpReceiver's[1] getSynchronizationSources() method allows
> WebRTC applications to monitor volume levels of call participants without
> having to use the costly getStats()[2] call. RTCRtpReceiver's
> getContributingSources() method enables WebRTC applications to monitor the
> volume level of participants whose audio is being mixed upstream if the
> mixer includes this data in the RTP extension headers.
>
> We intend to ship these interfaces in 59, and they are on nightly now.
>
> Tracking: https://bugzilla.mozilla.org/show_bug.cgi?id=1363667
>
> [1] https://w3c.github.io/webrtc-pc/#dom-rtcrtpreceiver
> [2] https://w3c.github.io/webrtc-pc/#dom-rtcrtpreceiver-getstats()
>
> Cheers,
> Nico Grunbaum
> -. --.
>
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>
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