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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
    • Firefox Contributors’ Quick Reference
    • Working with stack of patches Quick Reference
    • Phabricator vs GitHub
    • Pocket Guide: Shipping Firefox
    • Editor / IDE integration
    • Getting reviews
    • Levelling up
    • How to submit a patch
    • Data Collection
    • Data Review
    • Searchfox
    • Firefox AI Coding Policy
    • Introduction to Jujutsu
    • Git Tricks
    • Code Review FAQ
    • Reviewer Checklist
    • Debugging Firefox
      • Debugging Firefox with GDB
      • Debugging Firefox with LLDB
      • Debugging Firefox with rr
      • Debugging Firefox with Pernosco
      • Debugging Firefox with Valgrind
      • Debugging On macOS
      • Debugging On Windows
      • Debugging A Hang On macOS
      • Debugging WebRTC Calls
      • Understanding Crash Reports
      • Capturing a minidump
      • Debugging A Minidump
      • How to get a process dump with Windows Task Manager
      • How to get a stacktrace for a bug report
      • How to get a stacktrace with WinDbg
      • Symbolicating TreeHerder stacks locally
    • Configure Development Certificate
    • Signing Local macOS Builds
    • Firefox Source Code Directory Structure
    • Understanding Artifact Builds
    • Firefox for Mobile Devices
    • Supported Build Hosts and Targets
    • Working with ESR115
    • Engineering Show and Tell
    • Filing good bugs
  • 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
  • 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
  • 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

AI Agent Tools

  • AI Agent Tools for Firefox Development

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
  • Working on Firefox
  • Debugging Firefox
  • Report an issue / View page source

Debugging Firefox

How to inspect a running Firefox, and how to make sense of a crash or a hang that already happened.

Debuggers

  • Debugging Firefox with GDB
  • Debugging Firefox with LLDB
  • Debugging Firefox with rr
  • Debugging Firefox with Pernosco
  • Debugging Firefox with Valgrind

Platforms and specific areas

  • Debugging On macOS
  • Debugging On Windows
  • Debugging A Hang On macOS
  • Debugging WebRTC Calls

Crash reports and minidumps

  • Understanding Crash Reports
  • Capturing a minidump
  • Debugging A Minidump
  • How to get a process dump with Windows Task Manager
  • How to get a stacktrace for a bug report
  • How to get a stacktrace with WinDbg
  • Symbolicating TreeHerder stacks locally
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