Tampermonkey

Name: Tampermonkey
Rating: 4.6992 (5150 reviews)
Author: Jan Biniok

Tampermonkey is the world's most popular userscript manager.

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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:

696,577 -4,678

Rating:

4.70

(5,150) 9 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:

a day ago

Ranking

# 21 ▲ 2

Other rankings

#15 in Web Development

#18 in Other extensions ▲ 1

#36 in Appearance

#9 in money keyword 31

#9 in term keyword 9

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Other platforms

Tampermonkey (v5.3.3)

11,000,000 4.73

(72,311)

User reviews

Tampermonkey is a powerful and reliable Firefox add-on that empowers users to customize web pages via userscripts, enhancing their browsing experience with new features and cleaner interfaces. It offers a solid built-in editor and enjoys strong community support. However, some users have experienced installation problems involving corrupted files.

Pros

Allows customization of websites through userscripts
Has a robust built-in script editor with syntax highlighting and debugging
Enables enhancement of web browsing experience by adding new features or blocking unwanted content
Reliable and performs consistently across browsers
Supported by a large and active community providing ready-made scripts

Cons

Installation issues reported (possibly corrupted files)

Recent reviews

by zh*****, 2025-06-22

by Mi*****, 2025-06-22

good

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

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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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.
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