Custom JavaScript for Websites

About

Custom JS Injector allows you to run your own JavaScript code on any website. You can write, inject, and store custom scripts per domain — all from a clean, intuitive popup interface.

✨ **Features**:
- 💻 Inject JavaScript into any website via popup UI  
- 💾 Automatically saves your script per domain  
- 🔁 Auto-inject on page reload — no need to click again  
- 🔒 Scripts are stored locally (no remote sync or upload)  
- 🧠 No external dependencies, no bloat — just pure custom JS!

🚀 **Use Cases**:
- Debug page behavior or experiment with ideas  
- Clean up UI or hide elements  
- Extract data from web apps or dashboards  
- Apply personal UI/UX fixes on internal tools  

📝 **Important Notice – Website Restrictions**:  
This extension **does not work** on some websites that actively block JavaScript injection through browser-level security mechanisms like **Content Security Policy (CSP)**.

These websites include, but are not limited to:
- `google.com`
- `facebook.com`
- `twitter.com`
- `chrome.google.com`

Due to these restrictions, the extension’s inject feature will **not function** on those sites. This is expected behavior, and not a bug or issue with the extension.

To test or use this extension, please try it on other websites that do not have strict CSP rules — such as:
- `example.com`
- `wikipedia.org`
- internal tools or custom dashboards


📌 **Privacy**:  
This extension only uses local storage. **No data is shared, synced, or uploaded remotely.**