How to disable the installation of the add-on in Firefox using group policy

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Firefox is a popular web browser with many features and extensions. If you are an IT administrator and want to restrict the installation of Firefox extensions, Windows 10 provides a group policy setting that allows you to do so. Here is how to disable add-on installation in Firefox using the Group Policy Editor .

The Group Policy Editor is an essential component of the Windows operating system that allows you to do various things with ease. From enabling or disabling various appearance customization functions, you can do everything using the Group Policy Editor. By default, you cannot customize Firefox using the Group Policy Editor. However, if you are using Firefox v60+, you can manage various Firefox settings directly from the Group Policy Editor. You must first integrate Firefox into Windows group policy.

How to add Firefox to group policy

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GitHub provides an open source policy template that helps you integrate Firefox settings into group policy. Download the Firefox 60 policy template here. After downloading, decompress the contents of the ZIP file and you should find a folder called windows.

Open the windows folder and copy firefox.admx and mozilla.admx files. Then navigate to this path:


This is the C drive of your system. You can also press Win + R and enter it in the command field:


In the folder PolicyDefinitions insert the files firefox.admx and mozilla.admx.

Then open the folder windows > in-US . Here you can find two files called firefox.adml and mozilla.adml. Copy these two files and paste them here:


For a detailed reading, see this article – How to integrate Firefox into Windows group policy.

Disable add-on installation in Firefox using Group Policy

After following the steps above, open the Group Policy Editor. Press Win + R, type gpedit.msc and press Enter. Then navigate to this path:

Computer configuration > Administration templates > Mozilla > Firefox > Addons

Here you get a parameter called Allow add-on installations from websites. Double-click this option and select Disabled.

If you try to install an add-on, you will receive this error message:

That’s it!

I hope you find this advice useful.

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