I think the 3 choices can be condensed into 2 choices, and my convo with jorgev enhances my belief:
* Option 1 (custom) (default) (defaults to mozilla HQ gps)
* Option 2 (this addon may fetch and use my current gps coordinates)

I'll start reworking the code to only request the current coords if the developer "opts in" by choosing the "Use my current location" radio button.