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Overview

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A Quick Guide to Mozilla Applications

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Getting Set Up To Work On The Firefox Codebase

Working On Firefox

Working on Firefox
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The Firefox Build System

Mach
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Build System
Firefox CI and Taskgraph
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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
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
Fuzzing
Sanitizer
Performance Testing
Code coverage
Testing & Debugging Rust Code

AI Agent Tools

AI Agent Tools for Firefox Development

Releases & Updates

Mozilla Update Infrastructure
Watershed Updates
Desupport Updates
Update Verify

Localization & Internationalization

Internationalization
Localization

Firefox and Python

mozbase
Using third-party Python packages

Metrics Collected in Firefox

Metrics

Firefox Source Docs

Bug Handling
Policies
Report an issue / View page source

Policies

What each team is expected to do with the bugs it owns.

Triage for Bugzilla
New Feature Triage
What Needs My Attention
Regressions from GitHub

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