A bit lazy to search right now and provide links, but Mozilla laid off most of the Servo team members a few years ago. So it’s not really been under Mozilla for

A bit lazy to search right now and provide links, but Mozilla laid off most of the Servo team members a few years ago. So it’s not really been under Mozilla for all practical purposes. My understanding is that some of that work was, and continues to be, integrated into Gecko. But the momentum of replacing Gecko (a huge endeavor in itself) has been lost.