HeaderCraft Pro: Fast & Private MV3 Request

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# HeaderCraft Pro – Advanced HTTP Header & Query Parameter Manipulator

Take absolute control of your browser’s HTTP request lifecycle with **HeaderCraft Pro** – a lightning-fast, privacy-first, and ultra-lightweight extension designed specifically for developers, QA engineers, and security researchers.

Built from the ground up on modern **Chromium Manifest V3**, HeaderCraft Pro acts as a high-performance configuration layer. Unlike legacy extensions that execute heavy, resource-draining JavaScript loops for every request, HeaderCraft Pro compiles your rules directly into Chromium’s native C++ declarative network engine. The result? **Zero latency overhead** and **zero system bloat**.

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### ✨ Key Features

* **Dual-Engine Manipulation:**
  * **HTTP Headers:** Seamlessly append, overwrite, or strip HTTP Request Headers on the fly.
  * **Query Parameters:** Dynamically inject, replace, or strip URL query parameters.
* **Instant Environment & Profile Switching:** Create multiple profiles (e.g., *Dev-Local Admin*, *Staging Authenticated*, *Mobile Agent Simulation*) and switch between them instantly.
* **Smart Input Sanitization:** Automatically trims leading/trailing spaces from filters and keys to ensure rule accuracy.
* **Seamless Team Sharing:** Import and export your profiles as simple, portable JSON files to share configurations with your QA or dev team instantly.
* **Zero-Permission Installation:** Enjoy zero security warnings upon installation. Grant domain access selectively and on-demand only for the specific staging, local, or production servers you want to debug.
* **100% Privacy-First:** No remote servers, no telemetry, no tracking scripts. By utilizing Chrome's Optional Host Permissions model, the extension remains completely blind and sandboxed from your private browsing activity until you explicitly authorize access for a specific domain.

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### 🛡️ Why Professionals Choose Pro

Whether you are testing authentication tokens (`Authorization: Bearer <token>`), simulating geo-locations, bypassing edge caches, or running REST API tests, HeaderCraft Pro delivers robust, low-level browser network control without compromising your privacy or system performance.