I have a built in webcam on my laptop and a separate 1080P webcam, both of which are capable of displaying video in a 16:9 aspect ratio. I have zero issues getting the webcam to display in the 16:9 aspect ratio on Chrome, on the Windows 10 Camera App or Zoom, but it defaults to 4:3 on Firefox. The website I'm trying to broadcast on is a gaming website, Spelltable.com. I have zero issues using Chrome. A test on webcamtests.com displays that the default resolution for the browser is 640x480 and the max resolution for this webcam (the built in webcam) is 1280x720. I suspect the question at hand is how to change the default resolution on the browser?