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
• Multiple bookmarks, same URL: Supports different containers for bookmarks pointing to the same site (e.g., personal vs work YouTube)
• Popup overview: View and manage all container-assigned bookmarks
• Auto-cleanup: Mappings are removed when bookmarks or containers are deleted

How It Works

URL Fragment Identification

When you assign a container to a bookmark, the extension adds a unique identifier fragment to the bookmark URL:

https://www.youtube.com → https://www.youtube.com#cb-abc123

The #cb-<bookmarkId> fragment allows the extension to:

1. Identify which bookmark was clicked - Even if multiple bookmarks point to the same URL
2. Look up the correct container - Each bookmark can have its own container assignment
3. Open the clean URL - The fragment is stripped when opening the page

Navigation Interception

When you click a bookmark:

1. The extension detects the #cb- fragment in the URL
2. Extracts the bookmark ID from the fragment
3. Looks up the container assignment for that bookmark
4. Opens the clean URL (without fragment) in the assigned container

Note

: Typing a URL directly in the address bar is not intercepted - only bookmark clicks with the container fragment are redirected.

Example: Multiple YouTube Accounts

You can have two YouTube bookmarks open in different containers:

• Personal YouTube (youtube.com#cb-personal123) → Opens in "Personal" container
• Work YouTube (youtube.com#cb-work456) → Opens in "Work" container

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

Permanent Installation

Package the extension as a .xpi file and submit to 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
4. The bookmark URL will be updated with a unique identifier

Removing a Container Assignment

1. Right-click on the bookmark
2. Click "Set Container" → "Remove Container Assignment"
3. The bookmark URL will be restored to its original form

Opening a Bookmark in a Specific Container (One-time)

1. Right-click on any bookmark
2. Click "Open in Container"
3. Select the container (opens without changing the bookmark's assignment)

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

Permission	Purpose
bookmarks	Read and modify bookmark URLs
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
webNavigation	Detect bookmark navigation and redirect

Development

# Clone the repository
git clone https://github.com/yourusername/firefox-container-tab.git

# Load in Firefox for testing (see Installation above)

License

MIT License