User Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:58.0) Gecko/20100101 Firefox/58.0 Build ID: 20180130091144 Steps to reproduce: 1: Toggle media.autoplay.enabled=false in about:config 2: Go to a video conferencing site like https://talky.io/testroom42 3: Toggle media.autoplay.enabled=true in about:config 4: Go to the same website Actual results: When media.autoplay.enabled=false, webcam video stream doesn't show up, presumably because the website doesn't implement a video.play() function and there is no way to add exceptions to which websites can autoplay video. Expected results: If media.autoplay.enabled=false and the website is asking for webcam access, the website should be added to a temporary list of websites that are excempt from media.autoplay.enabled, such that the webcam works.

Thanks for the report! This is a known issue; Firefox nightly has an additional media.autoplay.enabled.user-gestures-needed pref which enabled autoplay after there's been some interaction, which resolves the webrtc video problem, but there's still an issue with audio in my testing. Chris, here's a bug for your camera permissions idea. :)