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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
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  • Processes, Threads and IPC
  • Firefox DevTools Contributor Docs
  • Toolkit
    • Profiles Service
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    • Autocomplete
    • Background Task Mode
    • Crash Manager
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    • Search Service
    • Shield Recipe Client
    • Nimbus
    • Messaging System Schemas
    • Picture-in-Picture
    • Prompts
    • Subprocess Module
    • Telemetry
    • 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
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  • Firefox on macOS
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  • Firefox AI Runtime
  • Accessibility
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  • 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
  • Debugging Intermittent Test Failures
  • 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
  • Report an issue / View page source

Toolkit

This is the nascent documentation of the Toolkit code that is shared across Firefox, Firefox for Android and other applications.

  • Profiles Service
  • JavaScript Logging
  • Add-on Manager
  • Autocomplete
  • 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
  • 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
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