On the domain controller, download the latest version of the Mozilla policy template.
Extract the ZIP file named POLICY_TEMPLATES.
In our example, all files were placed on the root of a directory named DOWNLOADS.
Access the directory named WINDOWS and copy the file ADMX files to the Policy definitions directory.
Access the correct language subdirectory.
Copy the ADML files to the correct language directory inside the Policy definitions.
On the domain controller, open the group policy management tool.
Create a new group policy.
Enter a name for the new group policy.
In our example, the new GPO was named: MY-GPO.
On the Group Policy Management screen, expand the folder named Group Policy Objects.
Right-click your new Group Policy Object and select the Edit option.
On the group policy editor screen, expand the Computer configuration folder and locate the following item.
Here are the Mozilla Firefox configuration options.
Access the folder named ADDONS.
Access the item named Allow add-ons installs from websites.
Select the option to disable this configuration.
In our example, we configured the system to deny the installation of extensions on Mozilla Firefox.
To save the group policy configuration, you need to close the Group Policy editor.
Congratulations! You have finished the GPO creation.