Pity they can’t use Servo as the rendering engine, even if it only deals with a small subset of style/layout properties. That kind of parallel layout engine should make building fluid 60fps interfaces a lot easier.
While investigating this, I have deep sympathies for whoever has to work with that taskcluster silliness because yikes that is some A++ grade obfuscation as compared to a .gitlab-ci.yml or .circleci or even the .travis.yml they migrated off of