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I'm no expert either, though I'm sure theoretically you can't do this. But in practice I think you're safe.

Is there a way to disable the dots so the browser stops murdering my CPU?

Yup, just hit the "V" key.

I guess you're right. YouTube already hosts a ton of game music videos and they don't seem to have any problems.

Thanks! Maybe a help page that shows all this hidden functionality would be useful to others?

Yes, as well as a volume control! You can also hit [tab] as a shortcut to toggle the sidepane with the active playlist.