Add-on Compatibility for Firefox 13

Firefox 13 has been in beta for a while now, so this blog post is a bit overdue. Here’s an almost comprehensive list of the changes that went into Firefox 13 that can affect add-on compatibility. There is more information available in Firefox 13 for Developers, so you should read that too.




Please let me know in the comments if there’s anything missing or incorrect on these lists. If your add-on breaks on Firefox 13, I’d like to know.

We will be doing an automatic compatibility validation and upgrading for add-ons on AMO that are compatible with Firefox 12, sometime in the next 2 weeks. I’ll also be working in Firefox 14 compatibility so that it doesn’t come in as late as this one.

13 comments on “Add-on Compatibility for Firefox 13”

  1. Kohei Yoshino wrote on

    The Japanese translation:

    1. Jorge Villalobos wrote on


  2. Joseft wrote on

    the new mozIAsyncLivemarks hasn’t been documented? I can’t found anything about it in MDN.

    1. Jorge Villalobos wrote on

      That’s right, it hasn’t been documented yet. If you don’t mind reading through code, here’s the interface code file.

  3. Nils wrote on

    I just updatet to FF 11 – many of my addons are broken and not supportet, so I won’t think about FF 12 upwards. But great to see that you’re testing that much! Thanks,

    1. m_gol wrote on

      You’re risking getting malware, old Fx versions are unsupported and can contain security vulnerabilities. If you don’t like this rapid schedule, you have really two choices. Either use the “corporate” Extended Support Release version of Firefox (currently 10.0.3) which is updated more rarely or choose a different browser.

  4. Patricia wrote on

    I am not sure if this is the right place to ask this but I have an HP Pavilion dv7 Notebook and it uses Digital Persona Finger Print Reader or it is also called HP SimplePass Identity Protection. All the new updates from Firefox past the 3.6 version won’t let me use the fingerprint to log on to web sites. It is my password protection. Do you know if you will develop an add-on to help me? Thank you.

    1. Jorge Villalobos wrote on

      Hello Patricia,

      I looked around and this is what I found: it looks like DigitalPersona is no longer working on this, and they won’t update their software for Firefox 4 or later versions. However, a compatible version was released by a different company called Egistec. See details here. I don’t know if they support only Firefox 4 or if they support all current versions, but moving up to 4 is at least a step in the right direction.

      I haven’t tested this software, so I don’t know if it will work in the same way. In the end it is up to the vendor (HP, I guess?) to keep their software up to date with the latest versions of the software they interact with. If they decide not to continue supporting their product, there’s very little we can do about it.

    2. Steve wrote on

      Patrica, I had the same question. I had all my passwords set-up with Digital Persona and then poof that company and HP no longer support Firefox. Thanks HP for that support! Great choice of vendors!

      Loyal HP customer NO MORE!

  5. Hanno Falk wrote on

    Under FF 12 I still frequently used the mouse hovering translation of the old google toolbar.
    Because the old “add-on compatibility reporter” (that includes a compatibility overrider) seems not to work with FF 13, I can’t enable the translation any more. Is there a work around?

    1. Jorge Villalobos wrote on

      There are plenty of translation add-ons available on AMO, many of which use Google Translate. You should give them a look and see if there’s one that does what you need.

  6. Karl wrote on

    Just uninstalled and reinstalled Firefox 13.0 after getting a warning about an automatic update error. Used REVO uninstaller to remove completely. After reinstalling Firefox 13.0, I am unable to get add ons as the site is marked as untrusted. If I over ride this warning the page that loads has obvious code issues.

    1. Jorge Villalobos wrote on

      Are you talking about the Mozilla Add-ons site? What do you mean by “obvious code issues”?