To enable or disable an extension in IE via group policy:
- First get the class IS of the IE extension by opening IE, clicking Tools (or the cog icon) and clicking Manage Add-ons. Click on the IE extention you want to enable / disable and click More information (blue text at the bottom). Take note of the Class ID
- Open your group policy that is applying to the computer account that you want to enable / disable the IE extension on and navigate to: Computer Configuration\Policies\Administrative Templates\Windows Components\Internet Explorer\Security Features\Add-on Management
- Enable the Add-on List policy and click Show
- Enter the Class ID (including the curly brackets) as the Value Name
- For the corresponding Value, enter a number 0 to disable the extension, 1 to enable the extension without the users being able to disable it or a number 2 to enable the extension and allow the users to disable it if they want
- Click OK
The extension will now be enabled or disabled in IE, depending on the option for the Value field that you entered.