Svarup Desai

For verifying firebase app check token? [https://firebase.google.com/docs/app-check/custom-resource-backend](https://firebase.google.com/docs/app-check/custom-resource-backend)

[isMuted](https://developers.google.com/youtube/iframe_api_reference#changing-the-player-volume) return ```true``` or ```false``` not 1 or 0 fix #482