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7.9
Overall

Tampermonkey

🌐 Chrome Extension

Unknown

Change the web at will with userscripts

12,000,000 usersRating: 4.7/5v5.5.0
Low Risk7.9/10

Scanned June 1, 2026

Risk Flags

Read and modify cookies for any site
Inject scripts into web pages
Unexpected: Manage and monitor your downloads
6.4
Permissions
6.0
Developer
10.0
Data Privacy
10.0
Policy Match

Permissions (19)

Show desktop notifications
notificationsunusual
Uncommon for ad blockers but not necessarily a concern
Low
Unknown permission: unlimitedStorage
unlimitedStorageacceptable
Common for ad blockers — used by most tools in this category
Medium
Read your open tabs and navigation activity
tabsacceptable
Common for ad blockers — used by most tools in this category
High
Unknown permission: idle
idleunusual
Uncommon for ad blockers but not necessarily a concern
Medium
Track detailed navigation events
webNavigationacceptable
Common for ad blockers — used by most tools in this category
High
Observe and analyze all web traffic
webRequestexpected
Standard for ad blockers — this permission is required for core functionality
Critical
Intercept and modify web traffic
webRequestBlockingexpected
Standard for ad blockers — this permission is required for core functionality
Critical
Store data locally in the browser
storageexpected
Standard for ad blockers — this permission is required for core functionality
Low
Add items to right-click menus
contextMenusexpected
Standard for ad blockers — this permission is required for core functionality
None
Unknown permission: chrome://favicon/
chrome://favicon/unusual
Uncommon for ad blockers but not necessarily a concern
Medium
Write to your clipboard
clipboardWriteunusual
Uncommon for ad blockers but not necessarily a concern
Medium
Read and modify cookies for any site
cookiesunusual
Not typical for ad blockers — review why this is needed
Critical
Schedule tasks to run periodically
alarmsacceptable
Common for ad blockers — used by most tools in this category
Low
Unknown permission: declarativeNetRequestWithHostAccess
declarativeNetRequestWithHostAccessunusual
Uncommon for ad blockers but not necessarily a concern
Medium
Inject scripts into web pages
scriptingunusual
Not typical for ad blockers — review why this is needed
Critical
Unknown permission: userScripts
userScriptsunusual
Uncommon for ad blockers but not necessarily a concern
Medium
Unknown permission: offscreen
offscreenunusual
Uncommon for ad blockers but not necessarily a concern
Medium
Access all websites you visit
<all_urls>expected
Standard for ad blockers — this permission is required for core functionality
Critical
Manage and monitor your downloads
downloadssuspicious
Unexpected for ad blockers — this permission has no clear purpose for this type of tool
High

Developer

NameNot disclosed
Verified PublisherYes
Known EntityNot recognized

Data Flows

Extension background service
Encryptedcookies, tab data, downloads

Privacy Policy Analysis

Policy Status
Policy found
http://tampermonkey.net/privacy.php
Actual Data Collection
  • cookies
  • tab data
  • downloads
Policy matches observed behavior

Alternatives to Consider

Chrome Web Store
0 permissions
9.2
Chrome Web Store
0 permissions
9.2
Chrome Web Store
0 permissions
9.2
Chrome Web Store
0 permissions
9.2
Chrome Web Store
0 permissions
9.2

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