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Overview

A Glossary of Common Terms
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Getting Set Up To Work On The Firefox Codebase

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Working on Firefox
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The Firefox Build System

Mach
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Firefox CI and Taskgraph
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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
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Code coverage
Testing & Debugging Rust Code

AI Agent Tools

AI Agent Tools for Firefox Development

Releases & Updates

Mozilla Update Infrastructure
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Desupport Updates
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Localization & Internationalization

Internationalization
Localization

Firefox and Python

mozbase
Using third-party Python packages

Metrics Collected in Firefox

Metrics

Firefox Source Docs

Toolkit
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DMG Install

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