PWA FC : bug with Firefox
Shahjahan Jewel The "Install app" button is not showing when on mobile with Firefox (on Android). I had no problem to see it in Chrome and install it on my phone.
The one-tap "Install app" button uses a feature only Chromium browsers (Chrome, Edge) support, so Firefox doesn't show it.
For now, you can still install on Firefox Android manually: ⋮ menu → Install (or Add to Home screen).
We'll look into what's possible on our end and discuss it with the team. Thanks for the report!