FYI, for Firefox on android, I had to use Firefox Nightly for this, as the main version doesn't support PWAs (for some reason)
Edit: I take it back, when I tried to do the install on regular Firefox a few days ago, it didn't work. It does work now, so regular Firefox works for this!
On the same version as you and I've installed this on Firefox but it behaves like a regular website (has an address bar, tabs, etc.). Some other sites installed like this don't have those.
Edit: I tried installing it again and now it works as intended. Maybe some backend update between when I first installed and now?
Same here, I had to clear the link off my home screen and reopen Kbin on Firefox to get a version that wasn't just a web link. For some reason, it looks so much cleaner to me now without the address bar at the bottom.