The Servo project is the only one built from scratch to do this a d some of its parts has been retrofitted to Firefox to enhance some parts there, but to fully

The Servo project is the only one built from scratch to do this a d some of its parts has been retrofitted to Firefox to enhance some parts there, but to fully move to multi-threadedness would mean that Firefox would have to do a complete switch to Servo and I don’t think Servo is ready for that.