I measured laptop PC power usage by using [power meter](https://www.amazon.co.jp/EC03N/dp/B00HLFA49E/ref=sr_1_11?dchild=1&keywords=%E3%82%AB%E3%82%B9%E3%82%BF%E3%83%A0%28CUSTOM%29&qid=1632961972&sr=8-11). It seems that Firefox uses more power than chrome browser during full screen video playback.
Bug 1733282 Comment 0 Edit History
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I measured laptop PC power usage by using [power meter](https://www.amazon.co.jp/EC03N/dp/B00HLFA49E/ref=sr_1_11?dchild=1&keywords=%E3%82%AB%E3%82%B9%E3%82%BF%E3%83%A0%28CUSTOM%29&qid=1632961972&sr=8-11). It seems that Firefox uses more power than chrome browser during full screen video playback. And software video decoder used more power than hardware video decoder.