Tampermonkey

Name: Tampermonkey
Rating: 4.6957 (5275 reviews)
Author: Jan Biniok

By: Jan Biniok

Tampermonkey is the world's most popular userscript manager.

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Features & Capabilities

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.

User Growth & Download Statistics

Add-on

By:

Jan Biniok

Daily users:

786,643 3.49K

Rating:

4.70

(5,275) 1 new ratings

Version:

5.5.0 Last updated: 2026-05-21

Version code:

6252912

Creation date:

2016-02-01

Risk:

Permissions:

Size:

1.64MB

URLs:

Website ,Privacy policy

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-14

Compare stats and ranking:

Ranking

# 21

Other rankings

#16 in Web Development

#18 in Other extensions

#42 in Appearance ▲ 1

#10 in money keyword 27

#15 in term keyword 13 ▼ 1

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Other platforms

Tampermonkey (v5.5.0)

12,000,000 4.73

(72,898)

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

Jan Biniok

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/tampermonkey/

Website:

https://tampermonkey.net/faq

Permission Change History

2026-05-21: Version 5.4.1 → 5.5.0

Add Permissions: contextualIdentities

Add Optional permissions: proxy

2023-12-07: Version 4.19.0 → 5.0.0

Add Permissions: alarms

User Reviews

Users consistently praise Tampermonkey as a highly useful, convenient userscript manager and express overall positive sentiment. Repeated criticisms focus on it being closed‑source and somewhat complex, raising enterprise security and permission concerns; reviewers suggest open‑source alternatives.

Pros

Considered highly useful/essential for customizing web apps
Seen as the most convenient/widely preferred userscript manager for Firefox
Generally well‑liked by users (positive sentiment toward the extension)

Cons

Closed‑source — multiple reviewers recommend open‑source alternatives
Perceived as complex and raising enterprise security/permission concerns

Recent reviews

by Fi*****, 2026-06-07

by av*****, 2026-06-06

by 终极*****, 2026-06-04

View all user reviews ›

Is Tampermonkey Safe?

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 Add-ons Store, 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

High This extension was recently updated in the past month. New updates may not be stable or safe.
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