At one point, Mozilla did make PWAs, but decided that the development was too difficult to maintain. So one person decides to just make an incredible complicated, well functioning workaround in their free time and share it with everyone.

Meanwhile, Chrome successfully implements and maintains PWAs, making it a killer feature. Many users who rely on web apps drop ff and become lifelong chrome users. Ff responds to future requests with, “well most of our users don’t use PWAs anyway.”