https://www.bleepingcomputer.com/news/microsoft/chromium-microsoft-edge-can-play-4k-netflix-video-unlike-chrome/

To give Google more cause for concern, the new Microsoft Edge is the first Chromium browser to support both the WideVine and PlayReady DRM technologies. By including Microsoft's PlayReady DRM, the Chromium-based Edge will be able to to play Netflix videos at both 1080p HD and 4K UHD resolutions.

When streaming Netflix videos on a computer, the resolution of the videos depends on the browser and DRM being used.