feat: Add initial Firefox container tab extension with popup UI, background script, manifest, and a comprehensive set of icons.

README.md

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+# Container Bookmarks
+
+A Firefox extension that associates bookmarks with containers. When you click a bookmark, it automatically opens in the assigned container.
+
+## Features
+
+- **Right-click context menu**: Assign containers to any bookmark
+- **Automatic container opening**: Bookmarks open directly in their assigned container
+- **Popup overview**: View and manage all container-assigned bookmarks
+- **Auto-cleanup**: Mappings are removed when bookmarks or containers are deleted
+
+## Installation
+
+### Temporary Installation (for development)
+
+1. Open Firefox and navigate to `about:debugging#/runtime/this-firefox`
+2. Click **"Load Temporary Add-on..."**
+3. Navigate to this folder and select `manifest.json`
+4. The extension icon will appear in your toolbar
+
+### Permanent Installation
+
+Package the extension as a `.xpi` file and submit to [addons.mozilla.org](https://addons.mozilla.org) for review.
+
+## Usage
+
+### Assigning a Container to a Bookmark
+
+1. Right-click on any bookmark (in bookmark toolbar, menu, or sidebar)
+2. Click **"Set Container"**
+3. Select the container you want
+
+### Opening a Bookmark in a Specific Container (One-time)
+
+1. Right-click on any bookmark
+2. Click **"Open in Container"**
+3. Select the container
+
+### Viewing Assigned Bookmarks
+
+1. Click the extension icon in the toolbar
+2. See all bookmarks with container assignments
+3. Click **×** to remove an assignment
+
+## Permissions
+
+- `bookmarks`: Read and manage bookmarks
+- `contextualIdentities`: Access container information
+- `cookies`: Required for container support
+- `storage`: Persist bookmark-container mappings
+- `tabs`: Open tabs in specific containers
+- `menus`: Add context menu items
+
+## Development
+
+```bash
+# Clone the repository
+git clone https://github.com/yourusername/firefox-container-tab.git
+
+# Load in Firefox for testing (see Installation above)
+```
+
+## License
+
+MIT License