How to disable Configuration Editor (about:config page) in Firefox browser

The Configuration Editor (about:config page) in Mozilla Firefox lists settings known as preferences. Most of these preferences are advanced settings that are not present in the Options panel. Changing them inappropriately can evoke strange behavior or lead to the break down the browser altogether. So, if you would like to prevent access to it or disable configuration editor in Firefox, follow the instructions below.

Disable Configuration Editor in Firefox browser

Disable Configuration Editor in Firefox browser

For disabling the Configuration Editor (about:config page) in Firefox, you’ll need to:

  1. Disable About:Profiles
  2. Disable About:Config
  3. Disable About:Support
  4. Disable About:Addons.

Please note this page is for expert and advanced users only. Also, the method requires you to make changes to the Registry Editor. Serious problems can occur if you make the changes in the Registry Editor incorrectly. Create a Registry backup first and then proceed carefully.

Press Win+R in combination to open the Run dialog box. Type, regedit in the empty field of the box, and hit ‘Enter’. After that, navigate to the following path address –


Create a new key under Policies key and name it as ‘Mozilla’. Again, create another new key under Mozilla key and name it as ‘Firefox’. Once done, select Firefox key and in right-side pane, do as follows:

1] Disable About:Profiles

In right-pane, right-click and select New -> DWORD (32-bit) Value option. Name the key as ‘BlockAboutProfiles’ and set its value to 1.

2] Disable About:Config

Again, right-click on the space of right-pane and select New -> DWORD (32-bit) Value option. Name it as ‘BlockAboutConfig’ and set its value to 1.

3] Disable About:Support

Follow a similar procedure as above. Right-click and select New -> DWORD (32-bit) Value option. Name the key as ‘BlockAboutSupport’ and set its value to 1.

4] Disable About:Addons

Finally, right-click and select New -> DWORD (32-bit) again and name it as ‘BlockAboutAddons’ and set its value to 1.

Now, close the Registry Editor and launch the Firefox browser. Open a new tab, type about: config in the address. Press ‘Enter’ key. Instead of seeing various Preferences, you’ll see an error message saying ‘Blocked Page’, denying access to Configuration Editor.

When you do this, when you try to open the about:config page, you will see a message:

Blocked Page, Your organization has blocked access to this page.

Let us know if this works for you.

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The author Hemant Saxena is a post-graduate in bio-technology and has an immense interest in following Windows, Office and other technology developments. Quiet by nature, he is an avid Lacrosse player. Creating a System Restore Point first before installing a new software, and being careful about any third-party offers while installing freeware is recommended.