[aardshark]

Do you have a newer MBP? I'm running Sierra on a 2013 MBP. I suspect part of my experience is due to Firefox relying more on the GPU than Chrome, and the GPU in this laptop sucks. I haven't experimented with turning off hardware acceleration in FF though.

[tshanmu]

yes, late 2017 MBP - ff Quantum does not use GPU on my MBP (when being on battery as well - pretty same performance) - that said, I dont use FF for any graphics heavy workloads - just normal stuff (jira, a few cloud consoles, gerrit etc)