Another comment mentions the quantum Firefox update from 2017. I think I was using Firefox on Android from around 2014. But I probably also used it after the update. I guess all my extensions were quickly whitelisted by Mozilla.
You could install custom extensions on Firefox Android. Now you have to jump through hoops to install anything that isn't blessed by Mozilla.
Indeed. They have too much authority with the marketplace. Does someone know if it is feasible to build Fenix from source, fork it and then add a startup function that sideloads any extension the user chooses, not just the blessed ones?
I'm considerung doing this, but don't want to spend a lot of time doing something impossible.