There was even an Oreilly book about it: https://learning.oreilly.com/library/view/programming-firefox/0596102437/ https://learning.oreilly.com/library/view/pro

There was even an Oreilly book about it: https://learning.oreilly.com/library/view/programming-firefox/0596102437/ https://learning.oreilly.com/library/view/programming-firefo...