User Scripts

userScripts

Medium RiskCategory: Developer ToolsView Official Docs↗

Technical Context

Provides access to the chrome.userScripts API for executing user-provided scripts in the User Scripts context. This enables Tampermonkey-style functionality for running custom scripts on web pages.

What This Means For You

The extension can run custom scripts that you or others create on websites. This is powerful for customization but means third-party code runs in your browser.

Related APIs

This permission enables access to these Chrome APIs:

chrome.userScripts

Common Use Cases

✓Userscript managers
✓Tampermonkey alternatives
✓Page customizers

How to Declare in manifest.json

Add the "userScripts" permission to your extension manifest:

{
  "manifest_version": 3,
  "name": "My Extension",
  "permissions": [
    "userScripts"
  ]
}

Related Permissions

Scripting

scripting

The extension can run code on web pages to modify how they look or behave. The actual pages it can access depend on other permissions it has.

medium

Developer Tools

devtools

The extension can add new panels and features to Chrome's developer tools. This is only useful for web developers who use the inspector.

low

Debugger

debugger

The extension can control web pages at a very deep level, including pausing code and changing how pages run. This is extremely powerful and typically only needed by developer tools.

high

Bookmarks

bookmarks

The extension can see all your saved bookmarks and folders, including their names and URLs. It can add new bookmarks, move them around, or delete them entirely.

medium

Top Sites

topSites

The extension can see a list of websites you visit most often, similar to what Chrome shows on a new tab page. It cannot see your full history, only your top visited sites.

medium