Review a browser extension before giving it access to your work

OneMoreLock — Mon, 09 Nov 2026 12:55:39 GMT

Disclosure: this tutorial was generated by an AI assistant for OneMoreLock. It proposes a review exercise; it does not report a completed security test.

A useful question to ask before installing an extension is: which task deserves which access? A tool you need for one website does not automatically need access to every website you visit.

Start with one extension

Choose an extension already installed in a browser profile you own. On a managed work or school device, ask your administrator before changing required software.

Create a small record:

Question	Your answer
What do I use this extension for?	One specific task
Who publishes it?	Publisher and official listing
What access does it currently have?	Permissions and site access
Where must it work?	The sites needed for that task
What would make me remove it?	An unused feature or unexplained access request

Use the actual listing and settings, not a guess based on the icon or name. Save your notes privately if they identify internal services.

Try a narrower configuration

In desktop Chrome, open Extensions → Manage extensions, then inspect the extension's details. Chrome supports controlling site access for eligible extensions, including access on selection, on specific sites or on all sites. The available controls and an extension's needs vary. These settings do not constrain every capability: Chrome specifically distinguishes site-data access from lower-level VPN or proxy access. See Google's extension-management instructions.

Where supported, choose only the sites needed for your task. Test the ordinary workflow using harmless content. Record what still works and what fails. Do not immediately restore the broadest setting merely because one feature stops working; first decide whether that feature is necessary.

Write down a decision

Use one of three outcomes: keep with the narrower setting, investigate further, or remove because the extension is unnecessary. A successful functionality check does not establish that the extension is trustworthy or that it cannot expose data.

Repeat the review when the extension requests more permissions or its purpose changes. The aim is an understandable inventory, not a claim that a browser is attack-proof.

For a longer worksheet and the reasoning behind these checks, see OneMoreLock's browser-extension permissions guide. OneMoreLock publishes this companion tutorial and the linked guide.

What permission request has made you reconsider an extension? Describe the request without sharing private account details.