Cookie Manager Browser Extension

Description:

This enterprise-grade browser extension provides comprehensive cookie management capabilities with advanced tab tracking and automatic cleanup functionality. Built as a Manifest V3 extension, it demonstrates cross-browser compatibility, intelligent tab lifecycle management, and secure cookie handling for modern web browsers. Unlike basic cookie viewers, this implementation features domain-aware cookie management, smart auto-cleanup that preserves cookies while multiple tabs are open, and granular control over individual cookies - delivering professional-grade privacy management with complete control over cookie operations. The application showcases browser extension architecture, permission management, background service workers, and real-time UI updates - essential capabilities for building sophisticated browser extensions that require precise control over user privacy and data management.

The Challenge:

Most cookie management extensions either provide basic viewing capabilities or require manual cleanup for each domain. I wanted to create a comprehensive, privacy-focused cookie manager that automatically handles cookie cleanup while respecting user context - preserving cookies when multiple tabs of the same domain are open and only cleaning up when the last tab is closed.

Development Story:

This project required deep understanding of browser extension architecture, particularly Manifest V3 requirements and the complexities of cross-browser compatibility. The most challenging aspect was implementing the intelligent auto-cleanup system that tracks tab lifecycle events and maintains domain reference counts to determine when cookies should be automatically deleted.

Key Challenge: Creating a seamless auto-cleanup experience that balances user privacy with usability - automatically deleting cookies when leaving a domain's last tab while preserving them when multiple tabs are open, all while providing clear visual feedback and user controls.

Technologies Used:

• HTML5 - Accessible popup interface with responsive design
• CSS3/SCSS - Modern UI with smooth animations and custom styling
• JavaScript (ES6+) - Background service worker, tab management, and cookie operations
• Chrome Extensions API - Manifest V3 with cookies, tabs, storage, and notifications permissions
• Webpack/Build Tools - SCSS compilation and asset management

Technical Architecture:

• Manifest V3 - Modern browser extension architecture
• Background Service Worker - Persistent tab tracking and cookie cleanup logic
• Popup Interface - Real-time cookie display and management controls
• Tab Lifecycle Management - Domain reference counting for auto-cleanup decisions
• Cross-Browser Support - Compatible with Chrome, Edge, Brave, Opera, and Firefox

Technical Implementation:

• Tab Tracking: Maintains domain reference counts across multiple tabs
• Cookie Operations: Read, delete, and manage cookies for current domain
• Auto-Cleanup Engine: Intelligent cleanup when last tab of domain is closed
• Permission Management: Secure handling of cookies, tabs, storage, and notifications
• Real-time UI: Dynamic popup updates with comprehensive cookie details

Core Functionality:

• Display all cookies for current website with detailed information
• Delete individual cookies with one-click functionality
• Bulk deletion of all cookies for current domain
• Smart auto-cleanup on page leave (preserves cookies when multiple tabs open)
• Modern, responsive interface with smooth animations

User Experience:

• Clean, intuitive popup interface with organized cookie listings
• Visual feedback with refresh and deletion actions
• Auto-cleanup toggle with clear user control
• Comprehensive cookie details including security settings and expiration
• Smooth animations and modern design for enhanced user experience

Technical Features:

• Full Manifest V3 compliance
• Cross-browser compatibility (Chrome, Edge, Brave, Opera, Firefox)
• Intelligent tab tracking with domain reference counting
• Auto-cleanup with smart preservation across multiple tabs
• Secure cookie operations with proper permission handling
• Local storage for user preferences

How to Use:

• Install the extension from the browser's extension store or load unpacked
• Navigate to any website and click the Cookie Manager icon in the toolbar
• View all cookies for the current domain with detailed information
• Delete individual cookies or all cookies for the current domain
• Enable auto-cleanup to automatically delete cookies when leaving the last tab of a domain

Code Highlight:

async function initializeExtension() {
   try {
      const tabs = await chrome.tabs.query({ active: true, currentWindow: true });
      currentTab = tabs[0];

      if (currentTab && currentTab.url) {
         const url = new URL(currentTab.url);
         currentDomain = url.hostname;
         document.getElementById('current-domain').textContent = currentDomain;
      } else {
         document.getElementById('current-domain').textContent = 'No active tab';
      }

      const result = await chrome.storage.sync.get(['autoCleanup']);
      const autoCleanupCheckbox = document.getElementById('auto-cleanup');
      autoCleanupCheckbox.checked = result.autoCleanup || false;

   } catch (error) {
      console.error('Error initializing extension:', error);
      document.getElementById('current-domain').textContent = 'Error loading domain';
   }
}

Key Learnings:

• Mastered browser extension architecture and Manifest V3 requirements
• Deep understanding of tab lifecycle management and domain tracking
• Learned to implement cross-browser compatible extensions
• Gained expertise in secure cookie handling and permission management
• Developed skills in creating intuitive privacy-focused tools

Future Enhancements:

• Cookie whitelisting for specific domains
• Export/import cookie data for backup and migration
• Advanced filtering and search functionality
• Cookie expiration notifications and warnings
• Integration with browser's built-in privacy settings
• Multi-profile support for different browsing contexts
• Detailed cookie analytics and privacy impact scores

Github:

Live demo:

Recommended Tools:

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Features:

• Responsive design
• Minimal design
• Display cookies for current website
• Comprehensive cookie details (name, value, domain, path, security, expiration)
• Individual cookie deletion
• Bulk deletion of all cookies for current domain
• Auto-cleanup on page leave
• Smart preservation when multiple tabs open
• Modern responsive interface
• Smooth animations and visual feedback
• Cross-browser compatible (Chrome, Edge, Brave, Opera, Firefox)
• Manifest V3 compliant
• User preference storage
• Notification support for auto-cleanup events