YouTube High Definition solves a number of annoying YouTube issues. Features Automatically play all YouTube videos in the highest resolution possible Specify your preferred resolution (4k, 1440p,1080p, 720p, 480p, 360p, 240p, 144p) Change video player size Control auto-mute volume and auto-stop video play Supports HD play when videos are embedded in external sites like Facebook, Twitter, Reddit, and others Set a preferred volume level for all videos Improve music on YouTube by always playing the best sound quality automatically