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I want to use firefox, I really do. But I can distinguish when it's running and when it's not by my macbook fan noise. And yes I've tried all kinds of clean ups. but it just sits there on the background consuming 40% of a cpu while doing nothing.

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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.

about:performance can now help you figure out what's going on.

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