At Help:Extension:Kartographer#<mapframe> usage you are referring to the GeoJSON editor geojson.io which is no longer maintained Source: https://github.com/mapbox/geojson.io
I suggest to change it to an up-to-date one like https://geoman.io/
Done
At Help:Extension:Kartographer#<mapframe> usage you are referring to the GeoJSON editor geojson.io which is no longer maintained Source: https://github.com/mapbox/geojson.io
I suggest to change it to an up-to-date one like https://geoman.io/