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For an opposing anecdote, I do not have this problem at all. Firefox is always snappy and uses less memory than Chrome on my Macbook.

Is it a retina macbook? Because I think that's one of the problems.

Also: connecting a 4k monitor to your Macbook to run Firefox on and things will get hot real fast.

Shame really, I love Firefox but keep coming back to Safari because of the CPU usage.