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You can watch Netflix in 1080p on macOS by using Safari. Chrome and Firefox don’t support the drm used by Netflix.

As for 4k on macOS:

>The DRM Netflix uses for 4K content is the new HDCP 2.2 (High-bandwidth Digital Content Protection), which macOS does not support as of Mojave. https://www.howtogeek.com/412033/how-to-watch-netflix-in-4k-...

On Windows you need to use Microsoft Edge (not the new one, the one that ships in-box) and it will render in 4K

Using the netflix microsoft store app also does this

The Netflix app has additional benefits such as higher bitrate audio and multichannel 5.1 sound.

Also supports downloads and offline viewing.

I have a 100-minute subway commute and a Windows 10 laptop. The ability to download is nice. If I wanted to, I could watch two movies a day in 4k.

>Chrome and Firefox don’t support the drm used by Netflix.

They do support Widevine (at the lowest security level). When I last looked, with some hackery it was possible to force 1080p playback: https://github.com/vladikoff/netflix-1080p-firefox/pull/34