User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36 Steps to reproduce: I have angular code that was working fine with firefox 61. When upgraded to firefox 62.0.2 it failed. Just run the attached angular component on FF 62.0.2. Actual results: The function navigator.mediaDevices.getUserMedia returns object of class LocalMediaStream. The function window.URL.createObjectURL throws this exception: ERROR Error: "Uncaught (in promise): TypeError: Argument 1 is not valid for any of the 1-argument overloads of URL.createObjectURL. Expected results: On Chrome, function navigator.mediaDevices.getUserMedia returns object of class MediaStream. That should happen. Was working with FF 61.0.2. LocalMediaStream has been discontinued.

LocalMediaStream is a MediaStream. Are you sure 61 was not returning a LocalMediaStream? createObjectURL() is expected to throw an exception in 62 for any MediaStream. See https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/62#Removals_3 61 should have been reporting a deprecation warning for this.