Add Javascript

Very lightweight extension to add JavaScript into websites. Inject custom JS into any domain or path instantly.

Add Javascript is a powerful, lightweight, and developer-friendly browser extension that allows you to inject custom JavaScript into any domain or specific URL path. Features: Toggle with Ease: Quickly enable or disable individual scripts, or use the Global Toggle to turn off all injections at once. Multiple Code Blocks per Script: Organize your JS code into separate blocks with titles for better readability and maintenance. Domain or Path Matching: Inject scripts on exact domains (medium.com) or specific paths (medium.com/membership). Subdomains and paths are handled independently. Search & Filter: Easily find your custom scripts among dozens of entries using the built-in search bar. Import & Export: Move your custom scripts between different browsers or backup your data with a single click via JSON files. Privacy Focused: No tracking, no external servers. Your custom scripts are stored locally in your browser.