From Newsgroup: alt.comp.software.firefox

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Mozilla Location Service (MLS) was an open geolocation system that mapped positions using publicly observable radio transmitters, including Wi-Fi
access points identified by BSSID, and it ran from 2013 until its closure
in 2024 where MLS had collected more than 44.43 million unique cell
networks and 1450 million unique WiFi networks.

https://en.wikipedia.org/wiki/Mozilla_Location_Service

The mobile app Mozilla Stumbler for Android could be used to contribute
signals of cellular networks and Wi-Fi access points at the device's GPS position. It was available in the Google Play store and F-Droid from
November 2014 to February 2021 after which it was officially retired.[10][11][12]

It was noted that contributions from Firefox for Android users "completely overwhelm[ed] the contributions made by the dedicated Stumbler app."[13]
Other apps, such as Tower Collector, were also available for the same purpose,[14][15] although they were limited to collecting information
related to cellular networks, except for NeoStumbler an Android application capable of collecting locations of cell towers, Wi-Fi access points and Bluetooth beacons.

Mozilla's client applications do not collect information about WiFi access points whose SSID is hidden or ends with the string "_nomap" (e.g. "Simpson-family-wifi_nomap").[19]

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