They all worked on my Samsung (S10e). Fiddly though - they need to be at just the right distance from the phone (further than normal - not too large in the screen), and are slow to respond.

Something a lot like http://hashapass.com/en/index.html

...yet.

They tried this before, with the S6, and had to relent...

gem fpm can do these sorts of conversions:
https://fpm.readthedocs.io/en/latest/

'One day' is not very far away: https://www.bbc.co.uk/news/business-47715415

Extensions get automatically disabled when they exceed the "maxversion" value, this is so they don't end up trying to work in an environment they are not designed for. Current extensions might say 3.5.*, so they'll be disabled when Firefox 4 comes out. They should then update the extension to work with the new version of FF.

maxversion 9.*.* essentially means never disable me.