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I'm not sure what the state of hardware accelerated video on OSX is, but at least on Linux Firefox doesn't support hardware decoding while Chromium does, and that leads to a 20% vs 5-10% CPU usage while watching Twitch source streams for me.

Not too long ago I did a check, was doing Twitch on Chrome / Macbook, and the thing just drained power. Turns out they were still using a Flash player, with a HTML5 player - which worked just fine and at a fraction of the power usage - an optional beta feature that I only managed to somehow activate using the browser's dev tools.

I hope the html5 player is the standard now.

Yes, the HTML5 player is now standard; Flash is only used as a fallback if HTML5 is not available.

Try Streamlink! Then you can watch the stream through VLC or any other player.