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Pair your browser with YouTube TV using a pairing code and control playback as if you were casting. On your TV, open YouTube and go to Settings → Watch on TV → Enter TV Code. You'll see a 12-character pairing code. Enter it in the extension popup, and the Cast button will appear in YouTube's player. From that point your browser acts as a remote: play, pause, seek, skip ads, and change volume all go directly to your TV.
rating_count is the Chrome Web Store ratings count, not a written-review count.