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I believe it's the later: safari is really good at not wasting energy. Anandtech looked into this not too long ago: http://www.anandtech.com/show/8327/browser-f

• Yoric 12y ago
  Yeah, Safari is good at it. I seem to remember that Apple has had battery-consumption measurement instrumentation that they only made available to outside developers recently. We have an ongoing project to make Firefox very good, too, but as all big projects, this might take time.