Script Monkey Next

About

Script Monkey Next is a modern Manifest V3 userscript manager for Chrome. Create, edit and run custom JavaScript on websites using Chrome's official chrome.userScripts API.

Features:

• Userscript manager — create, edit, enable and delete scripts from a popup or full dashboard editor.

• Script headers — use ==UserScript== metadata with @name, @description, @match, @exclude, @run-at and @version.

• Code editor — syntax-highlighted JavaScript editor with light and dark themes.

• Per-script control — enable or disable individual scripts, or turn off the whole engine with one switch.

• Execution worlds — run scripts in an isolated USER_SCRIPT world or in the page MAIN world.

• Match patterns — run scripts on matching HTTP/HTTPS pages using @match rules.

• Example script included — a demo badge script on first install so you can verify everything works.

• Themes — light, dark or system UI across popup, options and editor.

Why you'll like it:

• Built on Manifest V3 — uses Chrome's current extension standard with improved security and long-term support. Manifest V2 is deprecated and no longer accepted in the Chrome Web Store.

• Uses chrome.userScripts — the official MV3 API for running user-provided scripts on matching web pages.

• All scripts stay local — your userscripts are stored in your browser, not on any external server.

• No account required — install and start writing scripts immediately.

• Great for developers, power users and anyone who wants to customize websites with small JavaScript snippets.

Before scripts can run, enable "Allow User Scripts" on the extension details page (Chrome 138+) or turn on Developer mode on chrome://extensions.

Install Script Monkey Next — a Manifest V3 userscript manager — and customize the web your way.