Comment by lwansbrough

+1 for Firefox eating CPU. For some reason they can't track down the issue. If there's anyone from Mozilla reading, I'm on a Late 2013 13" rMBP fully loaded. I've made all the recommended changes to improve performance (and undone all of them as well to ensure they weren't the problem.) Firefox consumes most of my CPU and causes my fans to run at the full 6200 RPM while they try to cool my CPU which consistently reaches beyond 80C on any page running any Javascript.