Lets not make this out to be like it's Kerberos (more complicated than rocket science)... Making available another, region-specific version of your app isn't difficult. It's just the developer equivalent of an extra one-time TPS report (you have to setup/modify some build scripts and make some additional tests).
It's the equivalent of having builds for .rpm and .deb and then adding a .AppImage build. It shouldn't be that big a deal for the Mozilla Firefox team.
In fact, I bet they're freaking excited at the prospect of being able to make a real build of Firefox for iOS.