Also, I see options:

    geo.provider.use_corelocation: true/false # presumably for tracking on MacOS

    geo.provider.use_geoclue: true/false # presumably for tracking Linux users with Geoclue2 provider [1]

    geo.enabled: true/false # presumably, turns the whole thing off

It also appears[3][4], that setting geo.provider.testing to true might be required.

[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1063572

[2] https://stackoverflow.com/questions/24932199/how-to-change-f...

[3] https://security.stackexchange.com/a/268825

[4] https://stackoverflow.com/a/24937564