Firefox was never blocked from Google Play. It was up within an hour of Mozilla publishing it on the store. They had a beta you could manually install before

Firefox was never blocked from Google Play. It was up within an hour of Mozilla publishing it on the store. They had a beta you could manually install before that. That could be what is confusing you. You had to go to a website, click a link and then click install. So I really don't understand your usage of "open".