Firefox and other browsers will soon stop accepting a
MediaStream as the object argument for the
URL.createObjectURL static method, as the result of discussions among the developers. Firefox 54 will show a deprecation warning in the console when such code is found.
// Don't do this video.src = URL.createObjectURL(stream); // Do this video.srcObject = stream;
Update: The deprecation warning is not displayed on Firefox 54 due to a bug. Firefox 55 and later will show it properly.
Update 2: The stream argument support has been removed with Firefox 61.