Well what we know of Firnfeld is Anglea raids it. I kinda assume Firnfeld as a wild west kind of place because if Anglean society is based on Viking, then the greatest punishment would be exile. Hence to Firnfeld. Which then makes them ripe for Anglea to extort supplies from them. Especially if gangs in Firnfeld raid elsewhere. We know Anglea raids as far as Chaladon but it would be easier for them to just waltz into a coastal port of Firnfeld and demand tribute.
I go into this setup a bit in the VN's Anglean arc. It did lead to some interesting potential to what would happen if Firnfeld ever unified. Didn't go that far though, just left an idea of it.