From what I can tell, it was due to including a modified & minified version of Netflix’s actual video player, Cadmium

https://github.com/vladikoff/netflix-1080p-firefox/issues/28#issuecomment-501288986

Yeah it got banned for including the external netflix component. we shall see how we can bring it back

https://github.com/vladikoff/netflix-1080p-firefox/issues/63#issuecomment-1613734952

Hi @adamency , There were multiple reasons why it got removed, main one was that the cadmium player is a minified blob and they don’t like that. https://github.com/vladikoff/netflix-1080p-firefox/blob/master/src/cadmium-playercore-1080p.js