As you probably have read already old versions of TLS are going to be removed in March 2020. Obviously we don’t want to leave Firefox WebRTC users behind and vulnerable. Thus we are planing on disabling support for DTLS 1.0 also in March 2020.
According to our measurements the absolute majority (98.12%) of WebRTC services use DTLS 1.2 already today.
The remaining 1.88% need to start upgrading to DTLS 1.2 today.
To help with the transition and testing we added new user preferences to Firefox 71 (currently available as Firefox Beta):
peerconnection. dtls. version. min = 770
peerconnection. dtls. version. max = 771
To test with DTLS 1.2 only simply open about:config and set media.