Firefox on Glean (FOG)

Firefox on Glean (FOG) is the name of the layer that integrates the Glean SDK into Firefox Desktop.

The Glean SDK is a data collection library built by Mozilla for use in its products. Like Telemetry, it can be used to (in accordance with our Privacy Policy) send anonymous usage statistics to Mozilla in order to make better decisions.

If you have any questions, please reach out to the team on #glean:mozilla.org.

• Using Firefox on Glean
  • Getting Started with Firefox on Glean (FOG)
  • New Metrics and Pings
  • Glean Interface For Firefox Telemetry (GIFFT)
  • Using Firefox on Glean to Record Legacy Telemetry Events
  • Using Firefox on Glean to Record Legacy Telemetry Scalars
  • Writing Instrumentation Tests
  • Migrating Firefox Telemetry to Glean
  • Using Oblivious HTTP in Firefox on Glean
  • Glean SDK Documentation
• Developing Firefox on Glean
  • Built-in Pings
  • FOG code organization
  • Inter-process Communication (IPC)
  • Runtime Metric Definition Subsystem: JOG
  • Developing with a local Glean build
  • FOG Identifiers (Metric Ids, Submetric Ids, Ping Ids, …)
  • Adding a New Metric Type
  • Preferences and Defines
  • Storage
  • FOG Documentation Style Guide
  • Testing
  • Updating glean_parser
  • Updating the Glean SDK
  • Glean SDK Source