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mozconfig

Generates Firefox mozconfig build configuration files for preset and custom setups.

1|Updated Mar 17, 2026
Search Tags:#build-config#debug-build#firefox#sanitizer#mozconfig#try-server#artifact-build
One-click install
npx skills add https://github.com/mozilla/media-skills --skill mozconfig
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: mozconfig
Source: https://github.com/mozilla/media-skills/tree/main/mozconfig
Command: npx skills add https://github.com/mozilla/media-skills --skill mozconfig

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill removes the trial-and-error from creating Firefox mozconfig files by guiding users to the right build configuration for debugging, sanitizers, try server parity, and other development workflows.

Core Features & Use Cases

  • Preset build generation: Creates ready-to-use mozconfigs for common setups such as debug, ASan, TSan, coverage, artifact, fuzzing, and Valgrind workflows.
  • Try server matching: Reconstructs and flattens browser/config/mozconfigs definitions for local builds while stripping CI-only includes and automation settings.
  • Custom configuration guidance: Walks users through optimization, debug, sanitizer, and feature choices while enforcing platform-specific compatibility rules.
  • Practical example: A Firefox engineer can request a debug-plus-ASan configuration for Linux and receive a complete mozconfig with the required options and notes.

Quick Start

Ask for a Firefox mozconfig tailored to your platform and desired build type, and the Skill will generate a complete configuration ready to save and use.

Frequently Asked Questions about mozconfig

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I generate a Firefox mozconfig for a debug build with AddressSanitizer?▼

Generating a Firefox mozconfig for a debug build with ASan requires selecting specific ac_add_options for sanitizer and debug flags. This Skill produces a complete, platform-specific mozconfig file with the required options and compatibility notes.

What's the best way to match a local Firefox build configuration with try server settings?▼

Matching a local Firefox build with try server settings involves reconstructing and flattening browser/config/mozconfigs definitions. This Skill reconstructs those configurations while stripping CI-only includes and automation settings for local use.

Can I create a Firefox artifact build configuration across Linux, macOS, and Windows?▼

Creating a Firefox artifact build configuration across Linux, macOS, and Windows is supported through platform detection. This Skill enforces platform-specific compatibility rules to generate a safe, ready-to-use mozconfig file.

Does this mozconfig generator support fuzzing and coverage workflows?▼

This mozconfig generator supports fuzzing and coverage workflows by providing preset build generation. It delivers complete mozconfig files tailored for these specific development and testing setups.

How do I configure custom compiler and optimization options in a Firefox mozconfig?▼

Configuring custom compiler and optimization options in a Firefox mozconfig involves walking through specific feature choices. This Skill guides you through these selections while enforcing platform-specific compatibility rules.

Why does my locally generated Firefox build configuration include CI-only automation settings?▼

Locally generated Firefox build configurations may include CI-only settings if not properly flattened from source mozconfigs. This Skill resolves the issue by stripping automation-only includes during try server configuration matching.

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