ADD JAVASCRIPT

This extension for Chromium-based browsers like Chrome and Edge allows you to inject custom JavaScript into any website.
Take full control over web functionality by modifying behavior, adding automation, or interacting with page elements instantly.

View on Chrome Web Store

Core Features

  • Instant Injection: Apply your custom JavaScript code in real-time without needing to refresh the page.
  • Domain or Path Specific: Create scripts for specific websites (e.g., medium.com) or exact paths (e.g., medium.com/membership) – both work independently.
  • Multiple Code Blocks per Script: Organize your JS code into separate blocks with titles for better readability and maintenance.
  • Management Tools: Search through your scripts, toggle them on/off individually, or use the Global Toggle to disable all scripts at once. Export/import your entire library as a JSON file.

PRIVACY POLICY

At "Add Javascript" ("Extension"), we prioritize your privacy and data security. Our extension does not collect, store, or share any personally identifiable information (such as names, emails, or browsing history).

1. Data Collection and Usage

To provide a reliable and functional experience, the extension only uses "functional data" as described below:

a) Locally Stored Data

Your custom JavaScript codes, domain/path patterns, and settings are stored only on your own browser using Chrome's chrome.storage.local API. This data never leaves your device and is not accessible by us.

b) Network Requests

Unlike many other extensions, Add Javascript does not connect to any external servers to fetch or send data. It operates entirely locally on your machine.

2. Permissions and Justifications

Our extension requests the following permissions in the manifest.json file:

  • "storage": Required to save your custom JavaScript scripts and settings locally in your browser.
  • "host_permissions": ["<all_urls>"]: Required to inject your custom JavaScript into the websites you specify. Without this, the extension cannot execute code on pages.
  • "webNavigation": Required to detect page changes (including SPA navigations) and inject scripts at the right time.
  • "scripting": Required to dynamically inject JavaScript code into web pages.

3. Data Security

Since "Add Javascript" does not collect personal data, there is no sharing or selling of information. All scripts are processed locally on your browser and remain under your full control.

4. Contact

For any questions regarding the extension, you can contact us through our contact page.