Firefox Add-ons
11Versions
0Code reviewed

Not reviewed

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What our analysis found

Tampermonkey, used by 760,294 people, is not yet reviewed by Extension Auditor. Its permissions mean it can read and change data on all websites and can observe network requests. It comes from a publisher with 7 extensions and was last updated in May 2026.

Tampermonkey

Tampermonkey

ID: tampermonkey

Extension Info & Metadata

Status
Active
Version
5.5.0
Size
1.64 MB
Rating
4.7/5
Reviews
5,307
Users
760,294
Type
Extension
Updated
May 21, 2026
Category
N/A
Price
Free
Featured
No
Visibility
Listed
Mature
No
By Google
No
Trusted
No
This publisherTrack record
7extensions
All still listed

Publisher Contextual Analysis

Author
Jan BiniokView Profile
MX records exist
Yes
Domain exists
Yes
Is disposable
No
Is role-based
Yes
Mailbox exists
Yes
Website
Visit
Extensions
7
Active
5
Obsolete
0
Listed
7
Unlisted
0
Users
14,789,558

Screenshots & videos

Screenshot 1

Install growth

Item
Type
Severity
Description
webRequest
Permission
Critical
This permission enables the extension to monitor and analyze all web requests made by the browser. Rated Critical because it can observe all network traffic including sensitive data, track browsing behavior, and gather authentication tokens.
webRequestBlocking
Permission
Critical
This permission allows the extension to intercept, modify, or block any web request in real-time before it reaches its destination. Rated Critical because it can modify sensitive data (like passwords, credit cards) before encryption, redirect traffic to malicious sites, or block security updates.
<all_urls>
Host
Critical
Broad host access — the extension can read/modify content on every website.
Dangerous Permission Combination
Risk Factor
Critical
This extension can intercept, modify, and block web requests in real-time.
webNavigation
Permission
High
This permission enables monitoring of all browser navigation events and transitions. Rated High because it can track every page visit, navigation method, and browsing pattern, potentially exposing sensitive browsing behavior and user activities.
clipboardWrite
Permission
High
This permission allows modification of clipboard content. Rated High because it can inject malicious content into the clipboard, modify copied passwords, and manipulate copied data.
cookies
Permission
High
This permission provides full access to read and modify browser cookies. Rated High because it can steal session tokens, modify authentication cookies, and compromise accounts across websites.
downloads
Permission
High
This permission controls file downloads and accesses download history. Rated High because it can download malicious files, access sensitive downloaded documents, and track user download patterns.
Contextual Risk Factors
Risk Factor
High
The following context increases the overall risk:• 15% increase: Older manifest version lacks modern security controls
Broad Host Permissions
Risk Factor
High
This extension has broad host permissions allowing it to access many or all websites.
tabs
Permission
Medium
This permission enables tab management and monitoring. Rated Medium because it can track open tabs, access tab metadata, and monitor user browsing patterns.
unlimitedStorage
Permission
Medium
This permission removes storage quota restrictions. Rated Medium because it can store large amounts of user data without limits, potentially impacting browser performance and storing extensive tracking data.
storage
Permission
Medium
This permission allows storing data locally in the browser. Rated Medium because it can persist sensitive user data, track user activities over time, and potentially store malicious payloads.
contextualIdentities
Permission
Medium
This permission (Firefox) manages container tabs. Rated Medium because it can create, remove and inspect the identity containers that isolate a user's sessions from each other.
Older Manifest Version
Risk Factor
Medium
This extension uses Manifest Version 2
alarms
Permission
Low
This permission schedules periodic tasks. Rated Low because it can only trigger events at specified times without access to sensitive data.
notifications
Permission
Low
This permission displays system notifications. Rated Low because it can only show user-visible notifications without accessing system data.
idle
Permission
Low
This permission detects system idle state. Rated Low because it only observes user activity state without access to activity details.
contextMenus
Permission
Low
This permission adds items to browser context menus. Rated Medium because it only modifies right-click menus without access to page content.

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About this extension

Tampermonkey is the world's most popular userscript manager.

User reviews

Extension files

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URLs
396
IPv4
1

URLs

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Code Diff

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