I understand but you are in the minority. Most people don't use firefox and most firefox users didn't even know firefox supported installing apps that way on de

I understand but you are in the minority. Most people don't use firefox and most firefox users didn't even know firefox supported installing apps that way on desktop. If you yourself want to install PWAs on desktop then chrome, edge, and maybe even desktop safari all do it fine. You won't see the browser's chrome and you probably won't even know it's not running in firefox.