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> I'm not sure if there are any performance issues

I also use Firefox on a MacBook Pro(2014), I don't know if this existed before or not but, under battery > Apps using significant enery, Firefox is one of em', opening the same exact tabs on Safari doesn't show safari on the list

is this because apps that come with Apple are not included in the list or is Safari better at Energy consumption?

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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-faceoff-battery-l...

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.

For what its worth, Chrome does the same thing and has for quite some time.

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