Firefox Front-end

This is the nascent documentation of the Firefox front-end code.

• Address Bar
  • Where to Start
  • Codebase
  • Table of Contents
  • API Reference
• Browser Usage Telemetry
  • Tab and window interactions
  • Customizable UI
  • Profile Count
  • Context menu entrypoints
• Frontend Code Review Best Practices
  • Introduction
  • Intended audience and outcomes
  • What is expected from a frontend code review?
  • Expectations for the Reviewer
  • Expectations for the patch author
  • Technologies and Specifics
  • Commandeering patches
  • Community Participation Guidelines
  • FAQ
  • Further Reading
• Command Line Parameters
  • Known parameters
• Browser Startup
  • Invoking your code on browser startup
  • How do first run/first startup experiments work?
• Category manager indirection (callModulesFromCategory)
  • Consumer registration with the category manager.
  • Publishers/actors invoking consumers
  • Caveats
  • Why not just call consumers directly?
• CustomizableUI Component
  • CustomizableUI Module
  • DragPositionManager
  • OverflowableToolbar
  • PanelMultiView
  • SearchWidgetTracker
  • ToolbarContextMenu
  • CustomizeMode
• Enterprise Policies
  • Introduction
  • Kiosk Mode
• Form Autofill
  • Introduction
  • Debugging
  • Contents
  • Report Issues
• Firefox Home (New Tab)
  • For .sys.mjs files (system modules)
  • For .js, .jsx, .scss, or .css files
  • Building assets and running Firefox
  • Continuous development / debugging
  • Running tests
  • Code Coverage
  • Discovery Stream Developer tools
  • Detailed Docs
• Firefox Welcome Experience (about:welcome)
  • For .sys.mjs files (system modules)
  • For .js, .jsx, .scss, or .css files
  • Building assets and running Firefox
  • Continuous development / debugging
  • Running tests
  • Code Coverage
• Installer
  • Installer Build
  • Stub Installer
  • Full Installer
  • MSI Package
  • MSIX Package
  • Helper
• Installation Attribution
  • Firefox Windows Installers & macOS DMGs
  • Microsoft Store
• Default Browser Agent
  • Scheduled Task
  • Data Management
• Migration
  • MigrationUtils Reference
  • Migrators Reference
  • Migration Wizard Reference
• PageDataService
  • PageData Data Structure
  • PageData Collection
  • Supported Types of page data
• Places
  • History and Bookmarks
  • Where to Start
  • Governance
  • Table of Contents
• Messaging System
  • Vision
  • What does Messaging System support?
  • Messaging System Overview
  • Message Routing
  • UI Templates
  • Detailed Docs
• Search
  • Application Search Engines
  • Preferences
  • Telemetry
• tabbrowser
  • gBrowser
• Touch Bar
  • Overview
  • JavaScript API
  • Cocoa API
• UITour
  • UITour library API
  • Mozilla.UITour
• Firefox Branding
  • Additional reading
• Storybook for Firefox
  • Background
  • Running Storybook
  • Updating Storybook dependencies
  • Adding new stories
• Reusable UI widgets
  • Background
  • Designing new reusable widgets
  • Adding new design system components
  • Common pitfalls
• Other types of UI Widgets
  • Older custom elements in toolkit/widgets
  • Domain-specific Widgets
• Lit
  • Background
  • Using Lit
  • Writing components with Lit
• XUL and HTML
  • What is XUL
  • What requires XUL
  • When to use HTML or XUL
  • Mixing HTML and XUL
• Design tokens
  • What are design tokens?
  • Taxonomy
  • Naming guidelines
  • How it works
  • Theming
  • Help and support
  • Contributing
• JSON design tokens
  • Background
  • Quick start
  • Testing
  • JSON format deep dive
• Backup Component
  • High-level architecture
  • Backup Service Reference
  • Backup Resources Reference
  • Backup UI Actors Reference
  • Backup Archive Encryption
  • Schemas
• Sidebar
  • Introducing a new panel
  • State Management