Ideally neither. The article says We’re swapping in parts from our experimental browser Servo but servo.org says Servo is a modern high-performance browser eng

Ideally neither. The article says We’re swapping in parts from our experimental browser Servo but servo.org says Servo is a modern high-performance browser engine. That's quite a difference. Would be quite happy with servo being an engine and firefox being the browser (love firefox btw), just like how webkit/blink are the engines powering chrome/safari/opera. with bits and pieces of servo landing into firefox (just like how the CSS engine is landing in now). I could be wrong though.