This article explains what data is collected, how Mozilla uses it, and how to turn off technical and interaction data collection on your device.

What is technical and interaction data?

Technical and interaction data, also called telemetry data, is information about how Firefox functions on your device and how you use its features. This includes performance details like page load times, and memory usage, as well as insights into which Firefox features you interact with, such as bookmarks, tabs or settings. Additionally, it collects general device information, including your operating system, browser version and hardware specifications. Mozilla uses this data to enhance Firefox while respecting your privacy.

Where can I learn more about what specific data is collected?

For a more detailed view of the technical and interaction data collected by Firefox, see the definitions in the Glean Dictionary.

How does Mozilla use this data?

Mozilla uses technical and interaction data for many things, including to:

• Fix problems: Identify bugs and improve Firefox’s performance.
• Build better features: See which features are popular and how we can improve them.
• Understand trends: Learn how people use Firefox without compromising their privacy.

You can learn about all the ways Mozilla uses technical and interaction data in the Firefox Privacy Notice.

How to turn off technical and interaction data collection

Related content

If you’d like to dive deeper into how Firefox handles your data, check out these resources:

• Manage Firefox data collection and privacy settings
• Mobile - Manage Firefox data collection and privacy settings
• Telemetry – Firefox Source Docs documentation