Servo is not a major browser engine. It's a small research project. And Firefox continues to use Gecko. It has some bits and pieces from Servo in it and the Mo

Servo is not a major browser engine. It's a small research project. And Firefox continues to use Gecko. It has some bits and pieces from Servo in it and the Mozilla marketing team has dubbed everything "Quantum" for the Firefox 57 release to communicate that lots has changed, but it is still Gecko.