[hug]

Spoofing the user agent and decoding capabilities and [...] is a useful way to unblock things that are crippled on various browsers, indeed.

The problem here is requiring hardware-attested DRM: Widevine L1 on Edge on Windows, and Apple FairPlay on Safari on MacOS. The only way to get hardware attested DRM is via browser specific (i.e.: native code) support that interfaces with the OS & GPU drivers. You can't get there through an extension.

[Retr0id]

Right, but the point is that Netflix still refuses to play 4K on some browsers with hardware DRM support. Even getting it to work in Edge was a challenge last time I tried - iirc I got it working via https://github.com/lkmvip/netflix-4K-DDplus