Mozilla have claimed that their 57.x beta of Firefox (aka 'Quantum') uses 30% less memory than Google Chrome / other webkit browsers.
Try ~10x more (6th column is RSS):
darth 72483 0.0 0.6 5363724 77964 ?? S 4:30 PM 0:0.82 /Applications/Opera.app/ ...
darth 68443 1.1 0.3 5186124 81456 ?? S 4:25 PM 0:00.43 /Applications/Google Chrome.app/...
darth 92101 0.0 4.2 7095508 708936 ?? S 4:57 PM 11:31.62 /Applications/Firefox Beta.app/...
(All browsers open on news.google.com)
