Simple HTTP Headers Injector

A lightweight and powerful Google Chrome extension designed for developers and QA engineers. It allows you to inject custom HTTP headers into web requests on the fly.

## Features
**Global Injection:** Adds headers to all HTTP/HTTPS requests initiated by the browser.
**Request Types:** Works with all resource types (Main frame, AJAX/Fetch, Images, Scripts, CSS, etc.).
**Group Management:**
* Create up to **3 independent groups** of headers.
* **Toggle Groups:** Enable or disable specific groups instantly.
* **Rename Groups:** Customize group names (e.g., "Staging Env", "Debug Tokens") for better organization.
**Master Switch:** Instantly enable or disable the entire extension with one click.
**Auto-Save:** All changes (headers, values, names, toggles) are saved automatically in real-time.
**Conflict Resolution:** If a header already exists in the request, this extension **overwrites** it with your custom value.

## User Guide
### 1. Adding Headers
1. Click the extension icon to open the popup.
2. By default, one group is created. Click **+ Add Header** inside the group card.
3. Enter the **Header Name** (e.g., `Authorization`, `X-Custom-Token`) and **Value**.
4. The indicator **"Saved"** will appear at the top, confirming the rule is active.

### 2. Managing Groups
* **Rename:** Click on the group title (e.g., "Group 1") and type a new name.
* **Toggle:** Use the switch next to the group name to temporarily disable all headers in that group.
* **Collapse:** Click on the group header (outside the input box) to collapse/expand the group card to save space.
* **Delete:** Click the trash icon to remove a group completely.

### 3. Master Switch
* Use the toggle in the top-right corner of the popup header.
* **OFF:** No headers will be injected, regardless of group settings.
* **ON:** Headers from enabled groups will be injected.