What is Mozilla Stumbler?
Mozilla Stumbler is an open-source wireless network scanner developed by Mozilla. It collects GPS data related to nearby Wi-Fi networks and cell towers to contribute to the Mozilla Location Service (MLS)—an alternative geolocation platform that helps provide location data without relying solely on GPS or proprietary services.
How Does Mozilla Stumbler Work?
As you walk, cycle, or drive around, Mozilla Stumbler automatically detects and logs surrounding wireless signals. Each "stumble" helps expand Mozilla's open geolocation database by mapping new or less-known Wi-Fi access points and mobile towers. The more diverse your routes, the more useful your contributions will be to the MLS project.
To conserve your battery, the app smartly pauses data collection if you stop moving or if your battery level gets too low. This ensures minimal impact on device performance while still gathering valuable data during regular movement.
Key Features of Mozilla Stumbler
- Open-Source and Privacy-Focused – Fully transparent and open to community collaboration with no personal data collection.
- Wi-Fi and Cell Tower Mapping – Helps build a public geolocation service by detecting wireless networks.
- Battery-Aware Operation – Automatically pauses when idle or on low power to reduce energy consumption.
- Gamified Progress – Visualize your contributions through maps and stats to track your coverage impact.
- Works on the Move – Ideal for walking, biking, or driving around different neighborhoods and cities.
Tips for Getting Started
New users are encouraged to begin mapping major roads and intersections where wireless networks are most concentrated. After building a foundation, you can move on to smaller streets and less-traveled areas to make an even bigger impact. The broader your coverage, the more accurate the Mozilla Location Service becomes for all users globally.
Why Use Mozilla Stumbler?
For those passionate about open data and privacy-friendly technology, Mozilla Stumbler offers a meaningful way to contribute to a global geolocation platform. Unlike commercial alternatives, MLS is free to use and respects user privacy. Your anonymous contributions help developers, researchers, and even app builders improve location-based services without relying on centralized or commercial tracking systems.
Contribute to a Better, Open Web
Whether you're commuting, exercising, or exploring a new area, Mozilla Stumbler makes your movements count. Help expand a community-powered location service, one network at a time—while keeping your data private and secure.
