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Overview

  • A Glossary of Common Terms
  • A Quick Guide to Mozilla Applications
    • Gecko
    • Firefox for Desktop
    • Firefox for iOS

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
  • SpiderMonkey
  • GeckoView
  • Fenix
  • Focus for Android
  • WebIDL
  • libpref
  • Networking
  • Remote Protocols
  • Services
  • File Handling
  • Firefox on macOS
  • Firefox on Windows
  • Firefox AI Platform
  • Accessibility
  • 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

Localization & Internationalization

  • Internationalization
  • Localization

Firefox and Python

  • mozbase
  • Using third-party Python packages

Metrics Collected in Firefox

  • Metrics
Firefox Source Docs
  • A Quick Guide to Mozilla Applications
  • Report an issue / View page source

A Quick Guide to Mozilla Applications¶

  • Gecko
    • Networking (necko)
    • JavaScript (SpiderMonkey)
      • JavaScript modules
    • XPCOM
    • Process Separation / Fission / IPC / Actors
    • DOM + WebIDL
    • Style System (CSS)
    • Layout
    • Graphics
    • Localization (Fluent)
    • Profiles
    • Preferences
    • Observer Service
    • Principals / Security model
    • Chrome Protocol
    • Resource Protocol
    • About pages/protocol
    • Toolkit
    • Linting / building / testing / developer workflow
    • WebExtensions
  • Firefox for Desktop
    • Desktop architecture
    • Reusable UI Widgets
    • Tabbrowser
    • Address Bar
    • Search
    • Places
    • Firefox Sync and Application Services
    • Developer Tools
      • Browser Toolbox
      • Profiler
    • Installer
    • Application Update
  • Firefox for iOS
    • WKWebView
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