I knew Servo was part of Mozilla, but was confused by the article. It said 2013 was in use, but listed multiple major issues with it that I would think would prevent FF from being acceptable by any normal person.

Knowing it was a project and not a part of the current FF engine (as I had assumed) is the context I was missing.

Thank you. I don’t follow FF development closely enough to know this stuff, I just know enough to recognize a few project names.