Add-on Compatibility for Firefox 31

Firefox 31 will be released on July 22nd. Here’s the list of changes that went into this version that can affect add-on compatibility. There is more information available in Firefox 31 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 31, I’d like to know.

The automatic compatibility validation and upgrade for add-ons on AMO will happen soon, so keep an eye on your email if you have an add-on listed on our site with its compatibility set to Firefox 30.

14 responses

  1. Kohei Yoshino wrote on :

    Japanese translation:

    1. Jorge Villalobos wrote on :


  2. bhfw wrote on :

    My review for Bluhell firewall was removed. Who removed it? The dev or Mozilla addons site maintainer? It wasn’t spam/hate/advertisement. It was spot on. I even asked how to contact dev and he replied. I already contacted him.

    1. Jorge Villalobos wrote on :

      Reviews can be flagged by any AMO user, including the developer. The AMO Editors are in charge of evaluating flagged reviews and decide whether they should stay or go. If your Bluhell review was mostly focused on reporting a bug, then it’s very likely that’s the reason it was deleted.

  3. Paul Heil wrote on :

    Thanks now I understand why my autocomplete stopped working. I have already replaced all of my code per that MDN article, but I guess I didn’t need to do that.

    This change was about as hard to notice as when the getImageAt function was quietly added.

  4. Morgan Walter Champion wrote on :

    I’ve had to delete The Nautipolis theme from my Firefox 31 browser because you know that circular thing that comes down when you click on the thick line? When I tried out the Nautipolis theme, it covered most of my addon buttons whenever I used them. I’ve already moved my tabs to the bottom of the screen so I can use them.
    I have a request for Firefox 32. Could you please include a way to turn the dratted thing off and on?
    It would make that thing much less irritating

  5. BRIAN wrote on :



    I had just adjusted to the walloping I took when 30 hit me.

    FF is a pain.

    Is there any way short of Opera to end this aggravation?

    Improvements cease to be such when they make a user’s experience a headache.

    Why, other than job justification are theyy forced upon consumers?

    It seems Moz will not cease removing ad blocking programs until it wears down users to the point where we give up fighting and give into receiving unwanted advertisements.

    There’s simply too much money in this.

    Thank you,

    Please tell me how to end the “improved” versions.

    ps it seems the information requested in your slot titled “website” is asking for an email address:
    “The e-mail address you entered doesn’t look like a complete e-mail address. It should look like”

    1. Jorge Villalobos wrote on :

      We have never removed ad blockers from users. AdBlock Plus is still available on AMO. If it disappeared from your system, it’s possible that something in the Firefox update corrupted your Firefox profile. I would recommend looking for help on our support site.

  6. Kim Wilson wrote on :

    bmlk’s “filemail 0.6” has been working perfectly for 18 months,- – until I updated TBird last night to v. 31.0 in which the add-on is just dead. Now what?

    1. Jorge Villalobos wrote on :

      You should start by contacting the developer. It could be a bug in the add-on or a compatibility fix that hasn’t been released yet.

  7. Csordas Carol wrote on :

    please tell me why can not my beowserul (Firefox 31.0) show, that I use two extensions: SpeedBit Video Downloader and FoxLingo.
    If enabled, the other one disappears.
    31.0 If Firefox is not compatible for this, please let me know what you recommend, or what settings to make.
    Thank you.
    Csordas Carol.
    Ps. I have a dynamic IP.

    1. Jorge Villalobos wrote on :

      For help, please visit our support site. As far as I know, those add-ons should be working, and there’s no reason for only one of them to be enabled at once.

  8. linda cheslow wrote on :

    When will Norton’s Toolbar be compatible with 31.0 Firefox?

    1. Jorge Villalobos wrote on :

      Is your Norton software updated to the latest version? If so, and the toolbar still doesn’t work, you need to contact Norton (Symantec) about it.