Tampermonkey

Tampermonkey is the world's most popular userscript manager.

Tampermonkey is the world's most popular userscript manager, boasting over 10 million weekly users. Compatible with Chrome, Microsoft Edge, Safari, Opera Next, and Firefox, it offers an intuitive interface for managing and customizing userscripts. Key features include a comprehensive overview of active scripts, an integrated editor, ZIP-based import/export with cloud support (Google Drive, Dropbox, OneDrive), automatic update checks, and synchronization across browsers and cloud storage.

The extension ensures compatibility with Greasemonkey up to version 3.x and offers experimental support for version 4.x. For users seeking the latest features, a frequently updated BETA version is also available. Tampermonkey streamlines the userscript experience, making customization and script management seamless and efficient across multiple browsers.

Manifest V2 Add-on
By:
Jan Biniok
Daily users:
699,404 -1,163
Rating:
4.70
(5,148)
8 new ratings
Version:
5.3.3 Last updated: 2024-12-20
Version code:
5861448
Creation date:
2016-02-01
Risk:
Very high risk impact Low risk likelihood
Permissions:
  • alarms
  • notifications
  • tabs
  • idle
  • webNavigation
  • webRequest
  • webRequestBlocking
  • unlimitedStorage
  • storage
  • contextMenus
  • See more
Size:
1.58MB
URLs:
Website ,Privacy policy
Full description:
See detailed description
Source:
Firefox Browser Add-ons
Updated:
21 hours ago

Other platforms

Tampermonkey (v5.3.3)
11,000,000 4.73 (72,304)

User reviews

Tampermonkey is a powerful Firefox add-on that enables users to customize and enhance their web browsing through userscripts. It boasts a large supporting community, a capable built-in script editor, and operates reliably without affecting performance. Users appreciate its ability to provide features beyond standard browser options, making web experiences more efficient and personalized. No significant drawbacks were commonly mentioned in the user reviews.
Pros
  • Allows extensive web customization through userscripts
  • Large and active community providing many ready-made scripts
  • Robust script management with a built-in editor featuring syntax highlighting and debugging
  • Reliable performance without noticeable impact on browsing speed
  • Enables users to tailor their browsing experience beyond standard settings
Cons
    Recent reviews
    good
    by Fi*****, 2025-06-21

    by Fi*****, 2025-06-21

    by Fi*****, 2025-06-20
    View all user reviews ›

    Extension safety

    Risk impact
    Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

    Tampermonkey requires a lot of sensitive permissions. Exercise caution before installing.

    Risk impact analysis details
    • Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
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    • High ****** *** ********* ** ******* *** ******* ******* ** ****** *** *** ******** ******
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    • Medium ******* ******* ************* ***** *** ** ******* *** **** ******* ****** ******** *******
    • Medium ****** ********** ** ******** ********** *** ********* ******* ******** ****** ******** ****** ********
    Risk likelihood
    Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Browser Add-ons, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

    Tampermonkey has earned a fairly good reputation and likely can be trusted.

    Risk likelihood analysis details
    • Low This extension was updated more than 6 months ago. Older versions are more likely to be stable and safe.
    • Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
    • Low **** ********* *** **** **** ****** ******* ********** **** ****** ** ** ****** *** *****
    • Good **** ********* *** **** **** *******
    Upgrade to see full risk analysis details

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