Firefox Source Tree Documentation

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
  • Pocket Guide: Shipping Firefox
  • Editor / IDE integration
  • Getting reviews
  • Mercurial Overview
  • Mercurial Bundles
  • Capturing a minidump
  • Debugging A Hang On macOS
  • Debugging A Minidump
  • Debugging Firefox with GDB
  • Debugging Firefox with LLDB
  • Debugging Firefox with rr
  • Debugging Firefox with Valgrind
  • Debugging On macOS
  • Debugging On Windows
  • 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
  • Understanding Crash Reports
  • Firefox Source Code Directory Structure
  • Understanding Artifact Builds
  • Firefox for Mobile Devices
  • Supported Build Hosts and Targets
  • Engineering Show and Tell
• Bug Handling
  • Guides
  • Policies
  • Processes
  • Related documentation

Firefox User Guide

• Firefox DevTools User Docs
  • The Core Tools
  • More Tools
  • Connecting the Developer Tools
  • Debugging the browser
  • Extending DevTools
  • Migrating from Firebug
  • Contribute

Source Code Documentation

• Governance
  • Overview
  • Modules
• Firefox Front-end
  • Address Bar
  • Browser Usage Telemetry
  • Command Line Parameters
  • Enterprise Policies
  • Form Autofill
  • Firefox Home (New Tab)
  • Installer
  • Installation Attribution
  • Default Browser Agent
  • Migration
  • PageDataService
  • Places
  • Messaging System
  • Search
  • tabbrowser
  • Touch Bar
  • UITour
  • Firefox Branding
  • Storybook for Firefox
  • Reusable widgets/components
• DOM
  • DOM IPC
  • DOM Navigation
  • Script Security
  • Xray Vision
  • DOM Workers & Storage
  • Web IDL bindings
  • IOUtils Migration Guide
  • Federated Credential Management
• Editor
  • Editor module structure
  • Editor module specific rules
  • IME handling guide
• Layout & CSS
  • AccessibleCaret
  • Layout Engine Visual Tests (reftest)
  • Layout Debugger
• Graphics
  • Rendering Overview
  • Layers History
  • Asynchronous Panning and Zooming
  • Silk Overview
  • Moz2D
• Processes, Threads and IPC
  • IPDL: Inter-Thread and Inter-Process Message Passing
  • Gecko Processes
  • Utility Process
• Firefox DevTools Contributor Docs
  • Getting Started
  • Contributing
  • Recurring tasks
  • Automated tests
  • Files and directories
  • Tool Architectures
  • Frontend
  • Backend
  • Preferences
• Toolkit
  • Add-on Manager
  • Background Task Mode
  • Crash Manager
  • Crash Reporter
  • Feature Gates
  • Search Service
  • Shield Recipe Client
  • Nimbus
  • Messaging System Schemas
  • Picture-in-Picture
  • Prompts
  • Subprocess Module
  • Telemetry
  • Firefox on Glean (FOG)
  • Toolkit Modules
  • Toolkit Widgets
  • URL Classifier
  • WebExtensions API Development
  • Managing the built-in en-US dictionary
  • Application Update
  • Anti-Tracking
• SpiderMonkey
  • Building and testing SpiderMonkey
  • Running Automated JavaScript Tests
  • Debugger API
  • SavedFrame
  • JavaScript Language Feature Checklist
  • So You Want to Add a Bytecode Op
  • Components of SpiderMonkey
• GeckoView
  • Documentation
  • More information
• WebIDL
  • Overview
  • WebIDL source file flavors
  • Producing C++ code
  • Requirements
• libpref
  • High-level design
  • Low-level details
• Networking
  • HTTP Cache
  • The lifecycle of a HTTP request
  • HTTP Logging
  • Http3Session and streams
  • DNS over HTTPS (Trusted Recursive Resolver)
  • Submitting actionable networking bugs
  • New-to-Necko Resources - An Aggregation
  • Networking Test Guidelines
  • URL parsers
  • WebTransport
  • Captive portal detection
  • Connectivity checking
  • Neqo triage guideline
• Remote Protocols
  • Common documentation
  • Protocols
  • Architecture
  • Bugs
  • Communication
• Services
  • Remote Settings
  • Sync
• File Handling
  • URI Loader Service
  • External Helper App Service
• Firefox on macOS
  • Using macOS APIs
  • A primer on macOS SDKs
• Firefox on Windows
  • Windows DLL Blocklisting
• Accessibility
  • Architecture
  • Document Accessibility Lifecycle
  • GeckoView Thread Topography
  • Colors and High Contrast Mode
• Code quality
  • Static Analysis
  • Linting
  • Coding style
• Writing Rust Code
  • Basics
  • Rust/C++ interop
  • Generating Javascript bindings with UniFFI
  • Rust Update Policy
  • XPCOM components in Rust
• Gecko Profiler
  • Profiler Code Overview
  • Buffers and Memory Management
  • Instrumenting JavaScript
  • Instrumenting Rust
  • Markers
  • Profiling Memory
• Performance
  • General Performance references
  • Memory profiling and leak detection tools
  • Profiling and performance tools
  • Power Profiling
  • Performance Metrics
• XPCOM
  • Gecko Logging
  • String Guide
  • Reference Counting Helpers
  • Thread safety analysis in Gecko
  • Hunting Leaks
  • XPCOM Collections
  • XPIDL
  • Tutorial for Writing a New XPCOM Interface
  • XPCOM Hashtable Guide
  • XPCOM Hashtable Technical Details
  • How to make a C++ class cycle collected
• NSPR
  • Documentation
  • Getting NSPR
  • Community
  • Related Topics
• Network Security Services (NSS)

The Firefox Build System

• Mach
• Pushing to Try
• Build System
• Firefox CI and Taskgraph
• Managing Documentation

Testing & Test Infrastructure

• Automated Testing
• 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
• web-platform-tests
• GTest
• Fuzzing
• Sanitizer
• Performance Testing
• Code coverage
• Testing & Debugging Rust Code

Releases & Updates

• Mozilla Update Infrastructure
• Watershed Updates

Localization & Internationalization

• Internationalization
  • Locale management
  • UI Internationalization
  • ICU
• Localization
  • Localization
  • Fluent
  • Migrating Strings From Legacy or Fluent Files
  • Cross-channel
  • L10N Glossary

Firefox and Python

• mozbase
• Using third-party Python packages

Metrics Collected in Firefox

• Metrics

Indices and tables

• Index

• Module Index

• Search