> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.myndr.nl/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# How do I prevent students from installing extensions themselves?

|| The setting below is required for Myndr to work properly!
There are around 190,000 extensions in the Google Chrome Web Store, and the number in the Edge Add-ons Store is steadily growing too. Alongside very useful, fun and beautiful extensions, there are also plenty of poor and even dangerous ones. **There are also roughly half a million games in the Google Play Store** ready to be installed on a Chromebook.

If you don't want students to be able to install extensions or apps at random, you need to configure this in your admin environment. In the Google Admin console, this works as follows:

Go to** [Devices > Chrome > Apps](https://admin.google.com/ac/chrome/apps/user) ** & extensions and select the correct organisational unit (OU) on the left.

In the list under **Users & browsers**, the first item is: Allow users to install other apps & extensions. Next to it, under **Installation policy**, select **Block all other apps & extensions**:

![](https://storage.crisp.chat/users/helpdesk/website/5d85cd828c1b4400/alle-andere-1_xq2d0a.png)

Click **Save** at the top.

Then click the cog to the right of the option you just changed:

![](https://storage.crisp.chat/users/helpdesk/website/5d85cd828c1b4400/tandwiel_40t6bl.png)

You are now in the **Additional app settings** screen.

Choose **Do not allow** for** Android applications on Chrome devices**:

![](https://storage.crisp.chat/users/helpdesk/website/5d85cd828c1b4400/android-apps-op-chrome_185y5ji.png)

Untick **Extension**, **Hosted app** and **Legacy packaged app** under **Allowed types of apps and extensions**:

![](https://storage.crisp.chat/users/helpdesk/website/5d85cd828c1b4400/toegestane_w9qe31.png)

Choose **Do not allow** for **External extensions**:

![](https://storage.crisp.chat/users/helpdesk/website/5d85cd828c1b4400/externe-extensies_jra8i3.png)

Click **Save** at the top.

Within a few minutes, the new settings will be applied to all accounts in the selected organisational unit.