An open source userscript manager.

Violentmonkey provides userscripts support for browsers.


  • Run userscripts in web pages
  • Sync your scripts to Dropbox, OneDrive or Google Drive
  • Sync between browsers

Supported Browsers

Violentmonkey is built with web extension APIs. It supports a lot of browsers, including:

  • Chrome, Opera and many other Chromium based browsers
  • Maxthon
  • Firefox


You are absolutely welcome to contribute code to GitHub.

You are welcome to help with this website too. Documents, improvements, articles about Violentmonkey, etc.


  • Greasemonkey
  • Tampermonkey