https://developer.mozilla.org/en-US/docs/Web/API/RTCInboundRtpStreamStats/trackIdentifier
RTCInboundRtpStreamStats: trackIdentifier property - Web APIs | MDN
The trackIdentifier property of the RTCInboundRtpStreamStats dictionary is a string that identifies the MediaStreamTrack associated with the inbound stream.
web apispropertymdn
https://bugzilla.mozilla.org/show_bug.cgi?id=1728358
1728358 - Support RTCInboundRtpStreamStats.framesReceived
RESOLVED (nobody) in Core - WebRTC: Audio/Video. Last updated 2022-04-27.
support