I've been using FF on my 2015 MBP as my daily driver for at least 2 years and haven't had any problems. I mean, it's a battery hog for sure, but no more so than

I've been using FF on my 2015 MBP as my daily driver for at least 2 years and haven't had any problems. I mean, it's a battery hog for sure, but no more so than Chrome or any other modern browser with dozens of tabs open. Every once in a rare while flash will cause CPU usage to spike like crazy, but that isn't much of a problem anymore for obvious reasons. YMMV though I guess, it seems like a lot of people are still having performance issues, probably depending on which extensions are in use. Not sure on the use of CoreAnimation.