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Manifest V3 Native Extension

Customize any website with User Scripts

Scriptmonkey is a minimal, free, open-source user script manager built for Google Chrome.

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New Script
Add / Import ScriptDrag & drop a file here
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All Scripts (3)
D
Dark Theme Enforcer
https://*.example.com/*
G
GitHub Clean Feed
https://github.com/*
Y
YouTube Auto HD
https://youtube.com/*
Dark Theme Enforcerv1.2.0
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// ==UserScript==
// @name         Dark Theme Enforcer
// @version      1.2.0
// @description  Applies dark mode styling to example.com
// @match        https://*.example.com/*
// @run-at       document-idle
// @grant        none
// ==/UserScript==

(function () {
  'use strict';
  const darkCss = `body { background: #101114 !important; color: #e0e0e0 !important; }`;
  const style = document.createElement('style');
  style.textContent = darkCss;
  document.head.appendChild(style);
  console.log('[Scriptmonkey] Custom dark theme applied!');
})();
Features

Simple, Focused Capabilities

A lightweight user script manager focused on standard UserScript compatibility and local execution.

Built on Manifest V3

Built specifically for modern Chrome using the native userScripts API. Runs locally and respects your privacy.

Standard UserScript Support

Uses scripts with metadata headers (@name, @match, @include, @exclude, @version, ...) used by other script managers such as Tampermonkey, Greasemonkey, and Violentmonkey.

Popup & Dashboard UIs

Toolbar popup to toggle active scripts on current pages and a full dashboard to manage your script library.

Automatic Script Updates

Compares script version tags against remote @updateURL or @downloadURL endpoints for manual or batch updates.

Drag & Drop Import

Import local .user.js or .js files by dragging them into the dashboard or selecting them from your disk.

Embedded Code Editor

Built-in CodeMirror 6 editor with syntax highlighting, line numbers, error diagnostics, and Ctrl+S quick save.

Use Cases

Real-World Web Customization

Enhance your daily web browsing experience with lightweight user scripts tailored for your needs.

Custom Themes & Styling

Inject custom CSS or dark modes onto any web page to tailor site aesthetics to your liking.

Examples: Dark mode enforcers, custom typography, layout tweaks

Distraction-Free Browsing

Clean up news feeds, hide annoying sidebars, or remove sticky popups across your favorite platforms.

Examples: Clean feed layouts, auto-expand content, ad cleanup

Workflow & Shortcuts

Automate repetitive clicks, add keyboard navigation shortcuts, or pre-fill web forms automatically.

Examples: Keyboard shortcuts, auto-focus search, form automation

Custom Buttons & UI Widgets

Inject custom buttons, action toolbars, or interactive DOM elements directly into web page layouts.

Examples: Download buttons, quick action toolbars, custom UI widgets
Quick Start

Get Up and Running in 3 Easy Steps

1

Install Extension

Add Scriptmonkey to Chrome from the Web Store and enable "Allow User Scripts" in chrome://extensions.

2

Create or Import

Click "Add / Import Script" in the dashboard or drag .user.js files directly into the window.

3

Automate

Scripts execute automatically on matching web pages when enabled.

Ready to manage your user scripts?

Install Scriptmonkey today for a minimal, lightweight user script manager in Chrome.

Install ExtensionRead Documentation