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Comment by haack | Hacker News Reader

I appreciate I'm a single data point and it's not scientific but with the same "typical" session open, the idle stats spread across all processes, on MBP2017:

  Chrome (v70): ~10% CPU
  FF (v63): ~7% CPU

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For me the problem with Firefox on Mac are random CPU spikes, the average idle usage is OK. Or some tab getting stuck and skyrocketing to 100% CPU, killing 10% of my battery if I don’t notice it in time.

If you check on Bugzilla, there are many bug reports about it.

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