updated cadmium-playercore-1080p.js and get_manifest.js from truedread/netflix-1080p
in those files: changed references to use6Channels to window.use6Channels so it won't carsh if not defined
background.js: instead of redirecting to the changed player core replacing the request body so there are no CORS errors
include aes.js and sha.js in the add-on (freezing version, no web request that can potentially have CORS errors)
Probably only the changes in background.js did the trick, but