Thanks for sharing, I wasn't aware of that blog post. That said, their approach sounds kind of disheartening. I love being able to use extensions within my PWAs (primarily uBlock Origin, obviously), and some Android Chrome forks (Kiwi/Mises) let me do this, while still letting me feel like I'm in a dedicated app (i.e. no browser chrome at all). The firefox team really seem to stress here that they want to keep the chrome around the app (albeit different), which really feels like it goes against the grain of what I expect a PWA to be in the first place (a chromeless website).