All I get from polycentric.io is "Please add Polycentric to your home screen" (Android browsers call it installing) - even after I added it to my home screen (Firefox on Android). Works on Chrome though.
It somewhat works if you tell Firefox to get Desktop Site...
But they also broke the back button
Wow, that's odd.
We'll look into it. Thanks for checking it out
Both current Firefox for Android and Safari 17 (Beta) have a bug where display-mode: standalone doesn’t return true when running standalone, that’s probably what’s broken.
Perhaps a safer way is to use a different url (parameter) for the standalone mode.