Now I'm not sure what your argument is. When the problem is "they refuse to issue Widevine licenses", it doesn't really matter that a browser as huge as Firefox managed to get one.
It wasn't "if you want to use Linux", it was "if you want to make a browser".
Also the Widevine authorized for Linux is only 720p on Netflix.
Okay, but I'm not sure how well I can reconcile "you don't need it in the browser at all" and "it was considered important to force it into a browser standard".