Tampermonkey is the world's most popular userscript manager.

What is Tampermonkey?
Tampermonkey is an exceptional userscript manager with over 10 million weekly users. Available for several browsers, it provides an easy way to manage scripts, including features like overview of running scripts, built-in editor, ZIP-based import and export, automatic update checks, synchronization, and Greasemonkey compatibility. A BETA version with frequent updates is also available.
Version: 5.1.0 (Last updated: 2024-03-20)
Creation date: 2016-02-01
Weekly download count: 19,767
Firefox on Android: Yes
Risk impact: High risk impact
Risk likelihood: Low risk likelihood
Manifest version: 2
  • alarms
  • notifications
  • tabs
  • idle
  • webNavigation
  • webRequest
  • webRequestBlocking
  • unlimitedStorage
  • storage
  • contextMenus
  • See more
Size: 1.60M
Stats date:

Other platforms

Tampermonkey BETA
Tampermonkey BETA (v5.1.6194)
4.75 (4,484) 700,000
Tampermonkey BETA
Tampermonkey BETA (v5.1.6194)
4.90 (106) 737,707
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Tampermonkey is the most popular userscript manager, with over 10 million weekly users. It's available for Chrome, Microsoft Edge, Safari, Opera Next and Firefox.

Tampermonkey makes it very easy to manage your userscripts and provides features like a clear overview over the running scripts, a built-in editor, ZIP-based import and export (Google Drive, Dropbox, OneDrive), automatic update checks and also browser and cloud storage based synchronization. And finally it's compatible to Greasemonkey up to version 3.x with experimental 4.x support.

Note: If you want to install the more often updated BETA version, then you can get it from here: https://tampermonkey.net/?browser=firefox

User reviews
User reviews summary
These summaries are automatically generated weekly using AI based on recent user reviews. Firefox Browser Add-ons does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
  • Adds functionality to Firefox
  • Allows for custom scripts
  • Easy to use interface
  • Potential privacy concerns with Google Analytics
  • Some users are scared to install it
Most mentioned
  • Custom scripts
  • Google Analytics
  • Installation concerns
Recent reviews
by 礼白, 2024-04-10

by 礼白, 2024-04-10

View all user reviews
Risk impact

Tampermonkey is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install Tampermonkey if you trust the publisher.

Risk likelihood

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

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