Add-on Builder for Windows

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Editors’ Review

Download.com staffMarch 12, 2026

Mozilla Labs' Add-on Builder is a web-based IDE enabling developers to create Firefox add-ons using standard web technologies. It simplifies development and global distribution.

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Free

Pros
- Uses HTML, CSS, JavaScript for add-on creation
- Provides powerful APIs and tools
- Web-based development environment
- Feature-rich code editing capabilities
- Instant add-on testing and built-in version control
Cons
- Specific to Firefox add-on development
- Requires familiarity with Add-on SDK

Add-on Builder for Windows

Used Add-on Builder for Windows?

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Full Specifications

GENERAL

Release: June 21, 2011

Latest update: March 12, 2026

Version: 1.0

OPERATING SYSTEMS

Platform: Windows

Operating System

Windows 10
Windows XP
Windows 7
Windows Vista

Additional Requirements: Firefox 3.5 - 3.7

POPULARITY

Total Downloads: 1,452

Downloads Last Week: 1

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Developer’s Description

By Mozilla Labs

Create powerful Firefox add-ons using just HTML, CSS, and JavaScript.

Add-on Builder provides powerful APIs and tools that allow developers to create add-ons for Firefox using HTML, CSS and JavaScript. When your add-on is complete, we make it easy to share it with over 400 million Firefox users world wide.

The Add-on Builder is a web-based development environment that provides additional functionality for working with the Add-on SDK.

Edit code in a feature-rich environment, test your add-ons instantly, and use built-in version control & sharing.