Chrome's permission warnings are short sentences like "Read your browsing history" or "Read data you copy and paste". Each maps to a specific capability. A warning does not mean an extension is malicious, but it tells you what it could do if it were, or if it were later compromised.
A sample of documented warnings
Chrome's permissions reference lists the warning text for each permission. A few that people often meet:
| Permission | Warning shown |
|---|---|
| tabs | Read your browsing history |
| history | Read and change your browsing history on all signed in devices |
| clipboardRead | Read data you copy and paste |
| clipboardWrite | Modify data you copy and paste |
| bookmarks | Read and change your bookmarks |
| downloads | Manage your downloads |
| management | Manage your apps, extensions, and themes |
| nativeMessaging | Communicate with cooperating native applications |
| declarativeNetRequest | Block content on any page |
Permissions that show no warning
Not every permission produces a message. The reference lists none for cookies, webRequest, storage and scripting. That does not mean they are weak. Host permissions are what give scripting and request access meaning, and those are covered by separate site access warnings. activeTab also shows no warning, because you trigger it yourself.
So the absence of a warning is not a clean bill of health. Read the site access line too.
Which ones deserve a pause
Use judgment by matching the permission to the tool.
- Clipboard read on a tool that does not touch text is odd. Clipboard contents often include passwords and tokens.
- Management permission lets an extension manage other extensions. Few tools need it.
- Native messaging lets an extension talk to a program on your computer. That is legitimate for password managers and some developer tools, but it extends the trust boundary beyond the browser.
- History access on a tool unrelated to history or tabs is a mismatch.
What happens when permissions change
Chrome disables an extension when an update adds a permission that triggers a warning, until you accept it. When you see that prompt, treat it as a fresh install decision. Ask whether the new feature explains the new access. If the release notes say nothing, that is a reason to look closer.
A practical habit
Before you click Add, read the list aloud and ask whether each line fits the stated purpose. Then after install, tighten site access. Our five minute audit covers the routine.
Quick check
Does a long warning list mean the extension is bad?
No. Some legitimate tools need many permissions. What matters is whether they fit the extension's stated purpose and whether you trust the publisher.
Why is there no warning for cookies?
The reference lists none for the cookies permission. Access to a site's cookies still depends on host permissions, which do show a site access warning.
Sources
- Permissions list (Chrome for Developers)
- Permission warnings (Chrome for Developers)
- The activeTab permission (Chrome for Developers)
Last reviewed: 19 October 2026.
