I use a Firefox preference to pin my location to a spot near, but not at, my house:

user_pref("geo.provider.network.url", 'data:application/json,{"location": {"lat": 45.0, "lng": -122.0}, "accuracy": 128.0}');

I _believe_ this also stops wifi data from leaking anywhere.

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

There's also a plugin that allows varying levels of accuracy per-site. - LocationGuard

chrome: https://chromewebstore.google.com/detail/location-guard-v3/h...

firefox: https://addons.mozilla.org/en-US/firefox/addon/location-guar...