Userscripts topic
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.
Mayriads-EH-Master-Script
Adds dozens of features to E-Hentai.
google-search-sidebar
A user script and user style to move Google search tools to sidebar.
klas-helper-userscript
[DEPRECATED] 광운대학교 KLAS 사이트에 편리한 기능을 추가할 수 있는 유저 스크립트
TsingHuaELTHelper
显示清华社英语在线题目答案；支持班级测试；开放自定义设置
sox
Stack Overflow Extras: a userscript for the Stack Exchange websites to add a bunch of optional toggle-able features
Discord-Token-Login
A Javascript Project That Allows You To Login Your Discord Accounts With One Click.
agefans-enhance
增强 agefans 等网站播放功能，实现自动换集、画中画、历史记录、断点续播、弹幕等功能
alienware_arena_helper
Helps you to easily earn daily ARP and improves site with usable features
userscript-proxy
Browser extensions on any device