Tampermonkey

Name: Tampermonkey
Rating: 4.6991 (5148 reviews)
Author: Jan Biniok

Tampermonkey is the world's most popular userscript manager.

Download

Install Compare

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.

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:

Permissions:

alarms
notifications
tabs
idle
webNavigation
webRequest
webRequestBlocking
unlimitedStorage
storage
contextMenus

Size:

1.58MB

URLs:

Website ,Privacy policy

Full description:

Source:

Firefox Browser Add-ons

Updated:

21 hours ago

Ranking

# 21 ▲ 2

Other rankings

#15 in Web Development

#18 in Other extensions ▲ 1

#36 in Appearance

#9 in money keyword 30

#9 in term keyword 15 ▲ 1

Upgrade to see more rankings

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*****, 2025-06-20

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.
Critical ****** ****** ** *** ********* ****** * *********** ******** **** ** ** *** ******* *** ****** **** **** *** ******* *****
High ****** *** ********* ** ******* *** ******* ******* ** ****** *** *** ******** ******
High ****** ********* ** * ****** ******** ******** ********** * ******* ******* *****
High ****** ******* *** ********* ********* ******** ***** *** ** ********** ****** * ******** ******* *****
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

Instantly check and monitor your browser extensions' risks and permissions with Extension Guard.