Our friends at Mozilla have updated their copy of libwebrtc in Firefox 96. This means you can and should start testing with Firefox Nightly now if you are operating a webrtc service which supports browsers.
From that point on forward your chance of getting a functional problem addresses are very low. And on 2022-01-11 Firefox 96 will become Release and only security fixes have chance to get addressed.
This is the first update of libwebrtc in Firefox in a long time. It should bring a lot of improvements, but there are always edge cases which are not covered by automated tests yet. So if you care about the open web please start testing now.