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#

greasemonkey

A userscript is a kind of lightweight and less privileged browser extension written in JavaScript used to modify webpages. Userscripts may use the special API, usually referred as GM_API, allowing them to bypass same-origin policy and store data in separate storage not accessible to web pages. The technology was initially introduced in the GreaseMonkey extension for Firefox web browser, and then spread to other browsers, sometimes built-in, like in Presto-based Opera, sometimes with help of extensions, like in Chromium-based browsers. The most famous catalogs of userscripts are GreasyFork and OpenUserJS.

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UserScripts

Greasemonkey scripts ( Pagetual / Picviewer CE+ / DownloadAllContent ) 油猴腳本集 ユーザースクリプト集

  • Updated Oct 22, 2025
  • JavaScript

The open source code of this project is used for userscripts (油猴脚本) for desktop browsers, including Font Rendering (Customized) (字体渲染(自用脚本)- Font Rendering.user.js), and Search Engine Assistant (优雅的搜索引擎助手 - Google & Baidu Switcher.user.js), etc.

  • Updated Oct 24, 2025
  • JavaScript

Created by Aaron Boodman

Released March 28, 2005

Followers
488 followers
Repository
greasemonkey/greasemonkey
Website
github.com/topics/userscript
Wikipedia
Wikipedia

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