Add-on Compatibility for Firefox 39

Firefox 39 will be released on June 30th. Here’s the list of changes that went into this version that can affect add-on compatibility. There is more information available in Firefox 39 for Developers, so you should also give it a look.




Please let me know in the comments if there’s anything missing or incorrect on these lists. If your add-on breaks on Firefox 39, I’d like to know.

The automatic compatibility validation and upgrade for add-ons on AMO will happen in the coming weeks, so keep an eye on your email if you have an add-on listed on our site with its compatibility set to Firefox 38.

5 comments on “Add-on Compatibility for Firefox 39”

  1. Kohei Yoshino wrote on

    Japanese translation:

  2. Michael Kaply wrote on

    Wasn’t -remote actually put back for Firefox 39?

    1. Jorge Villalobos wrote on

      According to the tracking flags and comment 92, 39 is the first version where -remote was removed. I haven’t tested myself, however, so let me know if the information on the bug is incorrect.

      1. Michael Kaply wrote on

        Honestly that bug is incredibly confusing. The last comment seems to say it was backed out.

        But I see what you are saying. I have no idea.

  3. Igorr wrote on

    Developers of add-ons changing the appearance of the Add-ons Manager should be aware far in advance about its visual re-design for Fx40:

    That bug should be marked as addon-compat, by the way.