Mozilla Add-on SDK 
Using the Add-on SDK you can create Firefox add-ons using standard Web technologies: JavaScript, HTML, and CSS. The SDK includes JavaScript APIs which you can use to create add-ons, and tools for creating, running, testing, and packaging add-ons.
If you find a problem, please report the bug here.
Developing Add-ons
These resources should provide some help:
- Add-on SDK Documentation
- Community Developed Modules
- Jetpack FAQ
- StackOverflow Questions
- Mailing List
- #jetpack on irc.mozilla.org
Contributing Code
Please read these two guides if you wish to contribute some patches to the addon-sdk:
Issues
We use bugzilla as our issue tracker, here are some useful links: