Header changer Lite2

Modifies HTTP request headers for the active tab only.

ModHeader Lite is a lightweight, open-source developer tool designed to dynamically modify HTTP request headers on the fly. Built on Chrome's secure Manifest V3 platform, this extension provides a fast and secure way to test APIs, bypass security headers during local development, or simulate different browser states. ### Key Features: * **Add & Modify Headers:** Set custom request headers (e.g., `X-Custom-Header`, `Authorization`, `User-Agent`) with custom values. * **Domain & Port Targeting:** Restrict rules to specific domains and custom ports (e.g., `localhost:8080`, `api.example.com`) so headers only apply where you want them. * **Cross-Tab Synchronization:** Configurations sync seamlessly across all active browser tabs in real time. * **Upgraded Modern UI:** Enjoy a redesigned, cleaner interface for effortless rule management. * **On/Off Toggles:** Quickly enable or disable individual headers without deleting your setups. * **Manifest V3 Compliant:** Built on the secure `declarativeNetRequest` API—modifies traffic natively at the browser engine level without inspecting or reading your page content. * **100% Offline & Private:** Zero analytics, zero tracking, and no external servers. Your data never leaves your machine. ### How to Use: 1. Click the extension icon in your toolbar to open the control panel. 2. Enter your Header Name, Value, and optional Domain/Port scope. 3. Toggle individual rules on or off as needed. 4. Click "Save & Apply"—your headers instantly take effect across all active tabs! 5. Reload your target page to test your updated headers in action. Perfect for web developers, API testers, and security researchers working with local dev environments, microservices, and targeted domains.