Firefox 43 Disable addon

3 posts, 0 answers
  1. David
    David avatar
    2 posts
    Member since:
    Dec 2015

    Posted 15 Dec 2015 Link to this post

    Firefox 43 has now officially disabled the fiddler hook addon citing it's unsigned in FF addons.

    Could not be verified and has been disabled.

    If someone can have a look at that I'd be immensely appreciative. because I love fiddler and use it a lot with FF :)

  2. Eric Lawrence
    Eric Lawrence avatar
    833 posts

    Posted 15 Dec 2015 Link to this post

    Hello, David--

    The Mozilla team has declined to sign the Fiddler addon, and the entire addon model upon which the addon was written is being removed from future versions of Firefox in the coming year.

    Fortunately, the Firefox addon isn't necessary to use Fiddler with Firefox; have a look at for details.

    Eric Lawrence
    Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Feedback Portal and vote to affect the priority of the items
  3. David
    David avatar
    2 posts
    Member since:
    Dec 2015

    Posted 15 Dec 2015 in reply to Eric Lawrence Link to this post

    Type about:config in the browser's address bar and hit enter. This loads Firefox's main configuration page.
    Confirm the warning prompt if it appears.
    Search for the preference xpinstall.signatures.required.
    Double-click on it to toggle its value.
    When you set it to false, you disable the add-on signing requirement.

    Works for me. Google is your friend :)

    See how we go in the future thanks for the prompt response and the info

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