To approve a browser extension, review who publishes it, which permissions it requests, what data leaves the browser, and how updates arrive. Allow only extensions that need the access they ask for, record an owner, and recheck whenever the permissions change.
Why extensions deserve vendor treatment
An extension is third party code that runs inside the browser where staff are signed in to everything. Depending on its permissions it may read page content, see browsing activity or act on sites for the user. That is the same trust decision as giving a supplier access to a system, only quicker and less visible.
What Chrome's documentation says about permissions
Chrome's extension documentation notes that some permissions trigger a warning users must allow and others do not. A broad host pattern that matches all URLs can change which warnings show, because the tabs warning does not appear when the extension also requests that pattern. The activeTab permission shows no warning and grants temporary host permission only to the site the user is on. When an update adds a permission that carries a warning, the extension is disabled until the user accepts it. The recommended practice is to request only what the main function needs and use optional permissions at runtime.
So you cannot rely on the warning text alone. Read the manifest.
The checklist
- Publisher. A named organization with a support page, a privacy policy and a way to report security issues.
- Need. One sentence on the business reason, owned by a person.
- Permissions. Compare each requested permission with that sentence. Treat access to all sites as a high tier request.
- Data. What is sent off the device, to where, and for how long is it kept?
- Updates. How does the extension update, and what happens to the permissions when it does?
- Alternatives. Is there a built in feature or a lower access option?
- Controls. Use your browser management to allow list approved extensions rather than asking staff to be careful.
Signals worth a closer look
| Signal | Why it matters |
|---|---|
| Access to all sites for a narrow task | More reach than the function needs |
| New permissions added in an update | Scope creep, or a change of owner |
| No named publisher or contact | Nobody to ask during an incident |
| Remote code or remote configuration | Behavior can change without a review |
Review on a schedule
Approval is not permanent. Recheck extensions at least yearly and whenever a permission or owner changes, and remove ones nobody uses. For a wider look at the risks, see browser extension security risks for developers.
Quick check
Is the Chrome Web Store listing enough to approve an extension?
No. A listing tells you what the publisher says. You still need to read the requested permissions and decide whether the access matches a real business need.
Should staff be allowed to install any extension?
For managed devices, most companies prefer an allow list. It turns approval into a decision you can record and review.
Safeguard offers a Chrome and Edge extension and a free scan at gold.safeguard.sh/scan, and its asset discovery can help you track what software is in use.
Sources
Last reviewed: 19 October 2026.
