Browser extension — When to use it and what it does

The browser extension complements LocalGuard’s protection for cases where you cannot or do not want to install the Windows agent on a device: a Chromebook, a shared computer where you only control the browser, or a computer running an operating system other than Windows.

What the extension does

The extension applies the same rules you configure in the panel (blocked domains, categories, exceptions) directly inside the browser where it is installed. When it detects an attempt to open a blocked page, it stops the navigation and shows a supervision notice instead of the page.

The extension also:

• Pairs to the device with a code or QR, just like a new agent in the Devices section.
• Can be protected with the same parental PIN you use elsewhere in LocalGuard, so the child cannot disable it from the browser itself.
• Sends and receives messages with the panel through its own messaging section, useful to warn about remaining time or communicate with the device.
• Reports its technical status (version, connection to the Core, active rules) so you can confirm from the panel that it is still working.

Important difference from the Windows agent

This is the most important thing to know before deciding whether the extension fits your case:

The Windows agent acts at the operating system level, before the browser even exists. The extension, on the other hand, is a program that lives inside the browser. That has a real consequence: browsers (Chrome, Edge, Firefox) disable extensions in incognito or private windows by default, and it is the browser’s own user who must manually grant the “Allow in incognito” permission for an extension to work there too.

This means that if a device only has the extension installed (without a Windows agent) and nobody has granted that permission, a child could open an incognito window to avoid the extension’s block. This is not a LocalGuard flaw: it is a design limitation of the browsers themselves, the same one that affects any parental control extension from any vendor.

Caution

If you need protection to also work in incognito with a guarantee, use the Windows agent on that device. The extension is the right complement when the Windows agent is not an option, not a substitute with the same guarantees.

Compatible browsers

The extension is published for Chrome, Edge, and Firefox. The behavior and installation process vary slightly depending on each browser’s extension store, but pairing with your account and rule enforcement work the same way in all three.

How to install and pair it

1. From the panel, go to Install and choose the extension for the browser you are going to use.
2. Install it from the browser’s official store (Chrome Web Store, Edge Add-ons, or Firefox Add-ons).
3. When you open the extension for the first time, it will ask for a pairing code. Generate that code from Devices → Link device in the panel.
4. Enter the code in the extension. The device will appear in your device list like any other.
5. If you want to prevent the child from unpairing or disabling it, set up the parental PIN in Settings → Security.

How to verify it is working

• Open the extension icon in the browser’s toolbar: it should show that it is connected and paired to your account.
• In the panel, under Devices, the device with the extension should show a recent connection.
• Try opening a domain you have blocked in a normal tab: you should see the supervision notice instead of the page.

What happens if it is uninstalled or disabled

If the child uninstalls the extension or disables it from the browser’s settings, the device stops reporting activity and applying rules. The panel will show it as a device without a recent connection, so you can notice and act.