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.
doukiscript
Userscript for importing Anilist lists to MyAnimeLIst
Booru-mass-uploader
This userscript allows you to mass-upload images to imageboard sites running *booru engines.
github-pr-reviewers
This project adds more features to github using user scripts.
yt_clipper
Mark up YouTube videos and quickly generate clipped webms.
TwitterHD
A userscript that forces twitter to always load images and videos in full resolution
userscript-enhance-bilibili-player
增强哔哩哔哩播放器的使用体验（Tampermonkey script）
GitHub-Tweaks
Userscript that adds tweaks to GitHub.
userscript-combine-tw5-and-search-engine-results
Userscript: Combine TiddlyWiki5 and search engine (Google) results
unedit-for-reddit
Creates a link next to edited and deleted Reddit comments to show the original from before it was edited. The unedited comment gets displayed inline.
irccloud-sws
✏️ Enables text styles in IRCCloud