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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
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    • 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
      • Internals
      • Obsolete Documentation
        • UITelemetry data format (obsolete)
        • Firefox Health Report (Obsolete)
        • Hybrid Content Telemetry (obsolete)
        • “activation” ping (obsolete)
        • “core” ping (obsolete)
        • “deletion” ping (obsolete)
        • Ecosystem Telemetry (obsolete)
        • GeckoView Streaming API
        • Details
        • “optout” ping (obsolete)
    • 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
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  • Remote Protocols
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  • File Handling
  • Firefox on macOS
  • Firefox on Windows
  • Firefox AI Runtime
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  • 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
  • Obsolete Documentation
  • Report an issue / View page source

Obsolete Documentation

  • UITelemetry data format (obsolete)
  • Firefox Health Report (Obsolete)
    • Architecture
    • Payload Format
    • Identifiers
  • Hybrid Content Telemetry (obsolete)
  • “activation” ping (obsolete)
  • “core” ping (obsolete)
  • “deletion” ping (obsolete)
  • Ecosystem Telemetry (obsolete)
  • GeckoView Streaming API
  • Details
  • “optout” ping (obsolete)
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