Firefox Source Docs

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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
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
Machine Learning
Accessibility
Code quality
Writing Rust Code
Gecko Profiler
Performance
XPCOM
NSPR
Network Security Services (NSS)

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
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

MessageHandler
Report an issue / View page source

MessageHandler¶

MessageHandler is the framework used to implement WebDriver BiDi modules in Firefox.

Introduction
Simple Example

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