Disable installing add-ons in Firefox (how to)

firefox browserAdd-ons, plug-ins or extensions will certainly give more features to your browser Firefox. But installing many can slow down your browser. Moreover, we can not trust every add-on (see example here).

So, how to prevent others who share your computer, for example your children, from installing unnecessary add-ons?

Just follow the simple tutorial given below to disable installing add-on in Firefox.

1. In the address bar type about:config and hit Enter key and confirm the security warning.

2. Type ‘xpinstall’ in the Filter field and find ‘expinstall.enabled’ in the entry.

disable installing add-ons
3. Double click or right click this entry and select the context command ‘Toggle’ to change the value to ‘False’ and close your browser.

Now Firefox will stop the installation of add-ons without any message. If you want to install add-ons, just reverse the procedure. [Via – Jkwebtalks]

Kannan is a computer and Android enthusiast, a blogger by passion and a tech freak. His always ready-to-help attitude, knowledge and hard work is what drives him.


  1. someone

    Jan 29, 2014 at 3:35 pm

    I don’t have ‘xpinstall.enabled’ (Firefox 26).

    • Kannan

      Jan 29, 2014 at 5:36 pm

      Some preferences are obsolete in Firefox 26 and have no effect

  2. Pingback: Deshabilitar la instalación de extensiones en Firefox | Todos Geek

  3. Pingback: Deshabilitar la instalación de extensiones en Firefox

  4. Lukeman

    Apr 11, 2010 at 4:27 pm

    It is quite a new information to me. Thanks for sharing this nice tutorial.

Leave a Reply

Your email address will not be published.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