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| Review what each extension can access, and limit it where you can. |
A Chrome permission warning means an extension is asking for access to some of your data or browser features before you add it. Google says such a warning doesn't mean the extension is dangerous, only that it can be. So the useful question is not "is the warning scary?" but "does this access match what the extension does?" This guide explains the warnings and shows how to review and limit extension access.
What a permission warning means
When you install or update an extension, Chrome may show a warning about the data it wants to access. Google's help page Permissions requested by apps and extensions says you can accept the warning to allow the permission, or deny it to stop the extension from accessing that information. Google's installation guide adds that you should only approve extensions you trust.
Because the warning can appear when an extension is updated as well as installed, it is worth reading each time rather than clicking through.
How serious is each permission?
Google groups permissions into three alert levels:
| Level | What it covers, according to Google |
|---|---|
| High | Access to all data on your computer and the websites you visit. The extension can reach almost anything, inside or outside your browser. |
| Medium | Your data on all the websites you visit, or on a list of specific websites. This includes reading, requesting or modifying data on those pages. |
| Low | Your list of installed extensions, bookmarks, browsing history, tabs and browsing activity, physical location, or data you copy and paste. |
"Low" does not mean "harmless". A browsing history permission can still reveal a lot about you, so judge each permission against the extension's purpose.
Common warnings in plain English
Chrome's exact wording differs slightly between versions, for example "all websites" in some places and "the websites you visit" in others. The meanings below follow Google's help pages.
| Warning | What it lets the extension do |
|---|---|
| Read and change all your data on all websites | Read, request or modify data from every page you visit, such as your bank or social media pages |
| Read and change your browsing history | Read and erase your browsing history |
| Read and change your bookmarks | Read, change, add to and organize your bookmarks |
| Read data you copy and paste | Access information you have copied and pasted |
| Manage your apps, extensions, and themes | Enable, disable, uninstall or launch other extensions, apps and themes |
Developers declare these permissions, and Google's developer documentation notes that some of them trigger warnings that users must allow to keep using the extension. The full list is in the Chrome permissions reference.
Does the permission match the job?
Short answer: if you can't explain why a tool needs an access, treat that as a reason to pause.
- Ask what the extension does in one sentence, then check whether each permission supports that sentence.
- Ask whether it needs all websites or only one. An extension for a single service rarely needs your data everywhere.
- Check who built it. Google's installation guide says Enhanced protection warns you when an extension isn't trusted, which means its developer hasn't yet met Google's trust criteria. It also says new developers generally take a few months to become trusted, so the message doesn't prove the extension is malicious. Our guide to the Chrome unsafe extension warning covers that case.
Example (illustrative): A dark-mode extension needs to change how pages look, so access to many sites is plausible. A simple unit converter that asks to read your browsing history and copied text has no obvious reason to, so you would skip it or look for an alternative.
How to review the extensions you already have
- Open Chrome and select More, then Extensions, then Manage extensions.
- On an extension, select Details.
- Scroll to Permissions and read what it can access.
- Turn off or remove anything you no longer need.
How to limit site access
Google's Install and manage extensions guide describes two ways to restrict where an extension can read and change data.
In the extension's details
- In Manage extensions, select Details on the extension.
- Next to "Allow this extension to read and change all your data on websites you visit", choose a narrower option: the click-only option, On specific sites, or On all sites. Google's wording for the click-only option varies, for example "On select".
- To add sites, choose On specific sites, then under Permissions select Add next to "Allowed sites".
- To remove a site, select More next to it and choose Remove.
From the toolbar
- Select the Extensions icon at the top right.
- Select More next to the extension and point to "This can read and change site data".
- Choose When you select the extension, On [current site] or On all sites.
With the click-only setting, Google says the extension can access the current site only after you select it, and you'll need to select it again if you close the tab or window.
Limits to know about: Google says these settings only affect sites that match the extension's host permissions, and extensions that change lower-level network access, such as VPN or proxy extensions, aren't affected by the change. Restricting access may also stop some extensions from working on sites you haven't allowed.
When to remove an extension
- You no longer use it.
- Its permissions don't match what it does, and you can't find a good reason.
- You don't know the developer and can't verify them.
To remove one, right-click its icon next to the address bar and select Remove from Chrome, or select Remove on its card in Manage extensions. If you use Chrome through work or school, your organization might block some extensions or manage your browser. Google explains how to check if your Chrome browser is managed.
A quick habit that helps
- Install extensions from the Chrome Web Store, and read the warning before you approve it.
- Use Safe Browsing's Enhanced protection if you want an extra warning about untrusted extensions.
- Review your list every few months and remove what you don't use.
Conclusion
A permission warning is a prompt to check, not proof of danger. Compare each permission with what the extension actually does, limit site access wherever you can, and remove extensions you can't justify. For related help, read our guide to Chrome extensions that disappear after the Manifest V2 removal, our browser guides, or the complete guide to fixing common software problems. Firefox users can see how to find an add-on that changed their homepage or search.
Frequently asked questions
Does a permission warning mean the extension is malware?
No. Google says the warning doesn't mean the extension is dangerous, just that it can be. Decide by comparing the access requested with what the extension does.
Can I change permissions after I install an extension?
Yes, for site access. In Manage extensions, open Details and change the site access setting, or add and remove allowed sites.
Will limiting site access break the extension?
It can. With the click-only setting, you must select the extension each time you want it to work on a site. If it stops working where you need it, allow that site or choose a broader setting.
Why do I see a warning after an update?
Google says a warning can appear when you install or update an extension. An update may ask for new access, so read it before approving.
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