How to enable unsigned extensions in Firefox 43

Firefox logo with padlock

Mozilla has gotten serious about security, in version 43 they have disabled unsigned extensions. However, it is possible to skip this security measure

A few days ago, we had published that the new version of Mozilla Firefox had been released, the brand new version 43 which brought numerous novelties.

The big problem with this new version is that Mozilla has decided to disable all unsigned extensions in Mozilla Firefox. This has of course been done by security reasons, which is always good and noble. The problem is that there are some useful extensions that are not signed and therefore will not work.

Luckily, a workaround has been released, allowing you to skip this measure no matter what operating system you have, be it Windows, Linux operating systems and Mac OS X.

Minitutorial of how to enable any extension in Firefox

  1. First you must write in the url address bar the words "about: config", this will open the browser configurator.
  2. Now look for a line where it says «xpinstall.signatures.required»Followed by true
  3. Delete the word true and write the word false.
  4. Restart the Firefox browser to apply the changes.

In this way, you will get Firefox to re-enable all extensions, whether they are signed or not. Also keep in mind that if you use Windows, you will no longer be protected against typical extensions that hijack the browser and that are installed along with other programs when you click next without looking.

The truth is that this Mozilla measure seems excessive to me, since although there are many malicious extensions that can hijack the browser or install malware, there are also others that are not, but are unsigned. What should be done is allow the user to do some kind of exception list and I hope they put it in the next versions.

There are rumors that in the next version of the browser, they will remove this option from "about: config" from it. Therefore this solution is for now just something temporary(I hope Mozilla will enable the list of extensions I mentioned above though).

The content of the article adheres to our principles of editorial ethics. To report an error click here.

5 comments, leave yours

Leave a Comment

Your email address will not be published. Required fields are marked with *



  1. Responsible for the data: AB Internet Networks 2008 SL
  2. Purpose of the data: Control SPAM, comment management.
  3. Legitimation: Your consent
  4. Communication of the data: The data will not be communicated to third parties except by legal obligation.
  5. Data storage: Database hosted by Occentus Networks (EU)
  6. Rights: At any time you can limit, recover and delete your information.

  1.   roi said

    It is not necessary to delete the word "true" and write "false". Double-clicking already changes one for the other. At least on Windows.

  2.   Jesus said

    To the author of the article it seems excessive, not to me as a user, because the developers of those extensions that do not work because they are not signed, have had months and months to do it, so they show me as a user, that either the they had abandoned, or else they do not care about the safety of their users at all, in both cases, that they are not in the Mozilla add-ons store is a security plus for Firefox users, so we all win.

  3.   thor said

    I use firefox 41 and everything is perfect, the automatic axtualizations are removed and to hell ...

  4.   Joan said

    Perfect, thank you very much. (As Roi comments, it is only necessary to double click)

  5.   Mariano said

    Not working