Sorry, I forgot to mention that the script only works on computer. I think there’s no solution for the app. Maybe you could try this to see if it works:
So, recently I found out that (most) userscripts can now be used through Firefox on Android by installing an addon called violentmonkey .
After finding out about it I made some quick changes to some popular userscripts so that they work with mobile (most use keyboard shortcuts or don’t work with touch) as I found that the android app was a bit lacking in userscript support (no offence, love the app though!)
Script: https://github.com/cooljingle/memrise-all-typing/raw/master/Memrise_All_Typing.user.js
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