JS Mage > Inject Custom JavaScript Into Any Website, iFrames, Import/Export

JS Mage is a utility for injecting custom JavaScript directly into the MAIN execution world of web pages.

It natively bypasses standard extension isolation and Content Security Policy (CSP) restrictions that normally block inline script execution.

This allows your injected code to interact directly with the host page's window object, native variables, and frameworks.

The extension uses a draggable, resizable code editor injected into the active tab via a Shadow DOM, preventing the host page's CSS from breaking the editor's UI.

Core Features

● Execution Scopes: Maintain independent scripts for specific hostnames (Local) or a single script applied across all websites (Global).