<strong>Mozilla Stumbler is now obsolete.<strong> See <a href="https://discourse.mozilla.org/t/retiring-mozilla-stumbler/75206"> Retiring Mozilla Stumbler</a> for details. new obsol Android Stumbler for <a href="https://location.services.mozilla.com/">Mozilla Location Service</a>. This allows you to contribute a mapping from Cell towers and WiFi access points to a GPS location. This will be used for location services when no GPS is available, similar to <a href="http://www.openwlanmap.org/">OpenWLANMap</a>. While both, client and server, are free software, Mozilla only releases the <a href="https://location.services.mozilla.com/downloads">cell data</a>. WiFi data is withheld due to privacy/legal issues.