Where does “freiburgisch” come from?

freiburgisch (German) comes from German Freiburg, from German frei, from Middle High German vrî, from Old High German frī, from Proto-West Germanic frī, from Proto-Germanic frijaz, from Proto-Indo-European priHós, from Proto-Indo-European preyH- — to love, to please.

freiburgisch (German): of Freiburg (Germany)