Watch Add-on Videos

Close Download Formats:
This video requires a browser with support for open video: or the Adobe Flash Player. Alternatively, you may use the video download links provided.

Favorite Add-on Tools

  • Add-on Builder

    Use Add-on Builder to quickly and easily develop an extension for Firefox using common web technologies.

  • Add-on Packager

    Auto-generate add-on packaging by entering basic info and picking UI parts. Get working without setup.

  • Add-on Validator

    Check your add-on for common problems and errors. Open to anyone, not just add-ons hosted here.

  • All add-on development tools

Recent Add-ons News & Updates

  • Add-ons Update – Week of 2012/10/18

    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 3 weeks to review. Most updates are being reviewed within 10 ...

  • Review add-ons and get gear!

    Our volunteer reviewers make amazing contributions—with more than 3 billion downloads of add-ons on AMO, they are at the front lines ensuring add-ons are safe to use. To recognize their time and effort, we have launched a reviewer incentive program. For each add-on review, reviewers accumulate points that fetch them ...

  • Click-to-play plugin blocks coming in Firefox 17

    Firefox 17, coming out today on Beta, introduces a new solution for dealing with vulnerable or outdated plugins. Plugins that are blocked with the click-to-play flag will not load by default, but can be easily activated by users. This gives us a more user-friendly way to warn about plugins that ...

  • Jetpack Project: weekly update for October 09, 2012

    Project News Mozilla Labs just pushed out this awesome ‘about:profile‘ add-on that shows an interesting break-down of your web rowsing history – made with the SDK of course! SDK developer Matteo Ferretti has been working on some new modules that are ready for people to test out – ‘Geolocation‘ is ...

  • Possible window load handler failures in Firefox 16

    An add-on compatibility problem was recently discovered in Firefox 16. It is present in Firefox 16 and above, and we’re currently investigating it. The problem is that the window load event handler that many add-ons depend on isn’t fired under some circumstances. So far it appears that this only happens ...

All add-ons development entries