Add-ons Update – Week of 2016/01/27

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

In the past 3 weeks, 1446 add-ons were reviewed:

  • 1068 (74%) were reviewed in less than 5 days.
  • 74 (5%) were reviewed between 5 and 10 days.
  • 304 (21%) were reviewed after more than 10 days.

There are 212 listed add-ons and 2 unlisted add-ons awaiting review.

If you’re an add-on developer and would like to see add-ons reviewed faster, please consider joining us. Add-on reviewers get invited to Mozilla events and earn cool gear with their work. Visit our wiki page for more information.

Firefox 44 Compatibility

This compatibility blog post is up. The bulk compatibility validation was run last week. Some of you may have received more than one email because the first validation run had many false positives due to a bug and many add-ons failed validation incorrectly.

If you’re using the Add-ons SDK to build your add-on, make sure you’re using the latest version of jpm, since some of the JavaScript syntax changes in 44 affect add-ons built with cfx and older versions of jpm.

As always, we recommend that you test your add-ons on Beta and Firefox Developer Edition to make sure that they continue to work correctly. End users can install the Add-on Compatibility Reporter to identify and report any add-ons that aren’t working anymore.

Extension Signing

The wiki page on Extension Signing has information about the timeline, as well as responses to some frequently asked questions. The current plan is to remove the signing override preference in Firefox 46 (updated from the previous deadline of Firefox 44).


Electrolysis, also known as e10s, is the next major compatibility change coming to Firefox. Firefox will run on multiple processes now, running content code in a different process than browser code.

This is the time to test your add-ons and make sure they continue working in Firefox. We’re holding regular office hours to help you work on your add-ons, so please drop in on Tuesdays and chat with us!


If you read the post on the future of add-on development, you should know there are big changes coming. We’re working on the new WebExtensions API, and we recommend that you start looking into it for your add-ons. You can track progress of its development in

We will be talking about development with WebExtensions in the upcoming FOSDEM. Come hack with us if you’re around!