That one is behind the `hasPremium` feature flag

Or just install Video Background Play Fix (which should just be the default, or at least in settings, but at least it seems to be a Mozilla repo).

I wish the audio quality of youtube videos matched other streaming services. Bandwidth-wise it's pretty minimal, but the audio quality isn't quite as good as competitors like Spotify (and the longer they take to upgrade audio bitrate, the longer the problem persists and uploaded content has lower audio fidelity)