I just did a clean install of OS X El Capitan and within an hour it was obvious that Chrome was better at managing memory. [extensions: UBlock Origin, Ghostery]

I just did a clean install of OS X El Capitan and within an hour it was obvious that Chrome was better at managing memory. [extensions: UBlock Origin, Ghostery] Personally, I think the browsers actually do beat each other in performance every couple of months. i.e. Chrome Version 49.0.2623.87 (64-bit) is better than (current firefox version) but next month it'll be the reverse.