firefox has something called the mozilla location provider, which maps wifi access points to locations, which is similar to what google maps uses when you have gps disabled on mobile
Go to about:config () and set geo.enabled to false.
: if you're on Android, you'll need either an unstable version (Beta, Nightly) or a fork (Fennec from F-Droid) of Firefox to get access to that page because Mozilla decided users of the standard distribution can't be trusted with these settings.
