When I started to learn a bit about Javascript and Webrtc technology, I encountered the problem that Firefox does not support capturing the sound of the entire computer (while Chrome can do this) and does not support capturing the sound of the application (Chrome can't do this either, and it's very bad). To be more specific, the MediaDevices.getDisplayMedia() method does not have audio capture support. And Firefox doesn't support private fields (Chrome does). All this is described on https://developer.mozilla.org/en-US/docs/Web/API/MediaDevices/getDisplayMedia and https://developer.mozilla.org/ru/docs/Web/JavaScript/Reference/Classes/Class_fields. It is very interesting, is this planned to be implemented in Firefox, and if so, when? It seems to me that this would be very useful for developers that trying to build some open free projects based on WebRTC Technology. Thank you in advance for your answer. And sorry for my english if I made a mistake somewhere.