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

• Modules
  • Mots config
  • Code Coverage
  • Core: Accessibility
  • Core: Animation
  • Core: Anti-Tracking
  • Core: APZ (Graphics submodule)
  • Core: Browser WebAPI
  • Core: Build and Release Tools
  • Core: Build Config
  • Core: Code Analysis and Debugging Tools
  • Core: Content Security
  • Core: Cookies
  • Core: Crash reporting
  • Core: C++/Rust usage, tools, and style
  • Core: Cycle Collector
  • Core: DLL Services
  • Core: docshell
  • Core: Document Object Model
  • Core: DOM File
  • Core: DOM Streams
  • Core: Editor
  • Core: Event Handling
  • Core: Gecko Profiler
  • Core: GeckoView
  • Core: Global Key Bindings
  • Core: Graphics
  • Core: HAL
  • Core: HTML Parser
  • Core: I18N Library
  • Core: ImageLib
  • Core: IndexedDB
  • Core: IPC
  • Core: JavaScript
  • Core: JavaScript JIT
  • Core: jsat
  • Core: js-tests
  • Core: Layout Engine
  • Core: Legacy HTML Parser
  • Core: libjar
  • Core: MathML
  • Core: Media Playback
  • Core: Media Transport
  • Core: Memory Allocator
  • Core: mfbt
  • Core: Moz2D (Graphics submodule)
  • Core: Mozglue
  • Core: mozilla-toplevel
  • Core: MSCOM
  • Core: Necko
  • Core: NodeJS usage, tools, and style
  • Core: NSPR
  • Core: PDF
  • Core: Permissions
  • Core: Plugins
  • Core: Preferences
  • Core: Private Browsing
  • Core: Privilege Manager
  • Core: Push Notifications
  • Core: Sandboxing (Linux)
  • Core: Sandboxing (OSX)
  • Core: Sandboxing (Windows)
  • Core: security
  • Core: Security - Mozilla PSM Glue
  • Security - RLBox
  • Core: Static analysis & rewriting for C++
  • Core: storage
  • Core: String
  • Core: Style System
  • Core: SVG
  • Core: UA String
  • Core: View System
  • Core: Web Audio
  • Core: Web Painting
  • Core: Web Workers
  • Core: WebGPU (Graphics submodule)
  • Core: WebRTC
  • Core: WebVR
  • Core: Widget
  • Core: Widget - Android
  • Core: Widget - GTK
  • Core: Widget - Headless
  • Core: Widget - macOS
  • Core: Widget - Windows
  • Core: XML
  • Core: XPApps
  • Core: XPCOM
  • Core: XPConnect
  • Core: XPIDL
  • Core: XSLT Processor
  • Desktop Firefox
  • Marionette
  • mozharness
  • firefox-ui
  • geckodriver
  • gtest
  • Mochitest
  • Mozbase
  • Performance Testing
  • Reftest (+ jsreftest + crashtest)
  • Tryselect
  • web-platform-tests infrastructure
  • XPCShell
  • Toolkit
• 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
  • PageDataService
  • Places
  • Messaging System
  • Search
  • tabbrowser
  • Touch Bar
  • UITour
• DOM
  • DOM IPC
  • DOM Navigation
  • Script Security
  • Xray Vision
  • DOM Workers & Storage
  • Web IDL bindings
  • IOUtils Migration Guide
• Editor
  • IME handling guide
• Layout & CSS
  • AccessibleCaret
  • Layout Engine Visual Tests (reftest)
• 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
  • Adding new words to the en-US dictionary
  • Application Update
• SpiderMonkey
  • Building and testing SpiderMonkey
  • Running Automated JavaScript Tests
  • Debugger API
  • SavedFrame
  • JavaScript Language Feature Checklist
  • 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
  • DNS over HTTPS (Trusted Recursive Resolver)
  • Submitting actionable networking bugs
  • New-to-Necko Resources - An Aggregation
  • Networking Test Guidelines
• Remote Protocols
  • Common documentation
  • Marionette
  • Remote Protocol (CDP)
  • WebDriver BiDi
  • 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
• Accessibility
  • 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
  • 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
• 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
• 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

• Testing Policy
• Configuration Changes
• 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

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