Please be aware that I posted the wrong link when I wrote the OT, I changed it after 5 minutes. The wrong link went to the prediction api key, not the location. The api key for location does NOT start with pdct…
From my point of view, installing anything mls (moz.loc.service) afterwards should not be done as yandex replaces this but letzs the device think it is mozillas location service.
For future SFOS releases there would be other options, one of all those cell-tower and wifi geolocating websites.