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Overview

  • A Glossary of Common Terms
  • A Quick Guide to Mozilla Applications

Getting Started

  • Getting Set Up To Work On The Firefox Codebase

Working On Firefox

  • Working on Firefox
  • Bug Handling

Firefox User Guide

  • Firefox DevTools User Docs

Source Code Documentation

  • Governance
  • Firefox Front-end
  • DOM
  • Editor
  • Style system (CSS) & Layout
  • Graphics
  • Processes, Threads and IPC
  • Firefox DevTools Contributor Docs
  • Toolkit
    • JavaScript Logging
    • Add-on Manager
    • Background Task Mode
    • Crash Manager
    • Crash Reporter
    • Internal URLs
    • Search Service
    • Shield Recipe Client
    • Nimbus
    • Messaging System Schemas
    • Picture-in-Picture
    • Prompts
    • Subprocess Module
    • Telemetry
      • Getting started
      • Concepts
      • Data collection
      • Data documentation
        • Common ping format
        • Environment
        • “main” ping
        • Crash ping
        • “backgroundhangmonitor” ping
        • “anonymous” ping
        • “first-shutdown” ping
        • Add-ons malware ping
        • “coverage” ping
        • “default-browser” ping
        • “deletion-request” ping
        • “downgrade” ping
        • “event” ping
        • “health” ping
        • “heartbeat” ping
        • Install Ping
        • Launcher Process Failure ping
        • “new-profile” ping
        • “sync” ping
        • “third-party-modules” ping
        • “uninstall” ping
        • “update” ping
      • Internals
      • Obsolete Documentation
    • Firefox on Glean (FOG)
    • Toolkit Modules
    • Toolkit Widgets
    • Fingerprinting Resistance
    • URL Classifier
    • WebExtensions API Development
    • Managing the built-in en-US dictionary
    • Application Update
    • Anti-Tracking
    • Translations
    • Session Store
  • SpiderMonkey
  • JS Loader
  • GeckoView
  • Fenix
  • Focus for Android
  • WebIDL
  • libpref
  • Networking
  • Remote Protocols
  • Services
  • Permissions
  • File Handling
  • Firefox on macOS
  • Firefox on Windows
  • Firefox AI Runtime
  • Accessibility
  • Media Playback
  • Code quality
  • Writing Rust Code
  • Rust Components
  • Gecko Profiler
  • Performance
  • Database bindings (SQLite, KV, …)
  • XPCOM
  • NSPR
  • Network Security Services (NSS)
  • Web Security Checks in Gecko

The Firefox Build System

  • Mach
  • Pushing to Try
  • Build System
  • Firefox CI and Taskgraph
  • Managing Documentation
  • Vendoring Third Party Components

Testing & Test Infrastructure

  • Automated Testing
  • Understanding Treeherder Results
  • Sheriffed intermittent failures
  • Turning on Firefox tests for a new configuration
  • Avoiding intermittent tests
  • Testing Policy
  • Configuration Changes
  • Browser chrome mochitests
  • Chrome Tests
  • Marionette
  • geckodriver
  • Test Verification
  • WebRender Tests
  • Mochitest
  • XPCShell tests
  • TPS
  • web-platform-tests
  • GTest
  • Fuzzing
  • Sanitizer
  • Performance Testing
  • Code coverage
  • Testing & Debugging Rust Code

Releases & Updates

  • Mozilla Update Infrastructure
  • Watershed Updates
  • Desupport Updates
  • Update Verify

Localization & Internationalization

  • Internationalization
  • Localization

Firefox and Python

  • mozbase
  • Using third-party Python packages

Metrics Collected in Firefox

  • Metrics
Firefox Source Docs
  • Toolkit
  • Telemetry
  • Data documentation
  • Report an issue / View page source

Data documentation

  • Common ping format
  • Environment
  • “main” ping
  • Crash ping
  • “backgroundhangmonitor” ping
  • “anonymous” ping
  • “first-shutdown” ping
  • Add-ons malware ping
  • “coverage” ping
  • “default-browser” ping
  • “deletion-request” ping
  • “downgrade” ping
  • “event” ping
  • “health” ping
  • “heartbeat” ping
  • Install Ping
  • Launcher Process Failure ping
  • “new-profile” ping
  • “sync” ping
  • “third-party-modules” ping
  • “uninstall” ping
  • “update” ping

The mozilla-pipeline-schemas repository contains schemas for some of the pings.

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