Welcome to the Add-ons Developer Community

• Add-on SDK and Builder

  Using the Add-on SDK and Builder, you don't have to work with XUL and XPCOM any more, but can develop Firefox add-ons using only JavaScript, HTML, and CSS. The SDK and Builder also simplify running, testing, and packaging your add-on, leaving you free to concentrate on writing the code.

• How-to Library

  Get add-on development guidance in a top-notch collection of tutorials, articles, and more.

• API & Language Reference

  The official documentation on APIs and languages. What you need, when you need it, to create your masterpiece.

• Extensions

  Complete documentation for developing extensions for Mozilla applications.

• Case Studies

  Start-to-finish success stories. See how add-on developers made magic with Mozilla.

All add-ons development documentation

• Add-ons Update – Week of 2013/08/07

  I post these updates every 3 weeks to inform add-on developers about the status of the review queues, add-on compatibility, and other happenings in the add-ons world. The Review Queues Most nominations for full review are taking less than 6 weeks to review. Most updates are being reviewed within 4 ...

  Posted August 7, 2013 by Jorge Villalobos

• August Featured Add-ons

  Our diligent community board has selected the featured add-ons for August! If you have an add-on to nominate, please send it to amo-featured@mozilla.org for the board’s consideration. It’s completely fine to submit your own add-on for consideration! Pick of the Month: Stylish Restyle the web with Stylish, a user styles ...

  Posted August 1, 2013 by Amy Tsay

• Add-on Compatibility for Firefox 23

  Firefox 23 will be released on August 6th. Here’s the list of changes that went into this version that can affect add-on compatibility. There is more information available in Firefox 23 for Developers, so you should read that too. General Consolidate Firefox search preferences. keyword.URL has been the bane of ...

  Posted July 24, 2013 by Jorge Villalobos

• Thanks for competing in the add-ons contest!

  Thanks to everyone who submitted add-ons for the Amp Your Firefox contest. If you’re still waiting for your add-on to be reviewed, no worries—as long as you submitted it before July 18, 2013 (7:59 a.m. GMT on July 19, 2013), your entry is valid. If your add-on doesn’t pass full ...

  Posted July 19, 2013 by Amy Tsay

• Add-ons Update – Week of 2013/07/17

  I post these updates every 3 weeks to inform add-on developers about the status of the review queues, add-on compatibility, and other happenings in the add-ons world. The Review Queues Most nominations for full review are taking less than 6 weeks to review. Most updates are being reviewed within 4 ...

  Posted July 17, 2013 by Jorge Villalobos

All add-ons development entries