Name Firefox Version 52.0b3 Build ID 20170202101509 User Agent Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0 Ubuntu 16.04 Steps to reproduce: 1. Launch Firefox and navigate to https://mozilla.github.io/webrtc-landing/gum_test.html 2. Click "Window" button. Expected: 1. Door hanger displays. 2. Options for Windows are displayed in a drop down. 3. There is a preview of the screen/window. 4. There is a drop down for permissions. Actual Results: 1. Preview page shows a "NotFoundError: The object can not be found here." error in red. 2. WebConsole shows : "TypeError: video.srcObject is null"
I don't have linux unfortunately. Jesup, does this reproduce for you?
I'm going to leave the needinfo for Jesup, but it does not reproduce for me on Ubuntu 16.04 with 52.0b3.