🎣 Fisherman - Advanced Anti-Phishing Protection

A sophisticated browser extension that provides real-time protection against phishing websites and malicious URLs with comprehensive analysis and blocking capabilities.

✨ Features

• 🔍 Real-time Detection: Analyzes URLs and page content as you browse
• 📊 Updatable Database: Malicious domain database can be updated from reliable sources
• 🎯 Heuristic Analysis: Detects suspicious patterns and domain similarities
• 📈 Intuitive Interface: Clearly displays risk levels with visual indicators
• ⚡ Proactive Protection: Blocks dangerous sites before they load
• 📝 Content Analysis: Examines page text, forms, and links for phishing indicators
• 🔔 Smart Notifications: Alerts you about potential threats without being intrusive

🛠️ Installation

1. Clone or download the extension files
2. Open Chrome/Edge and navigate to chrome://extensions/
3. Enable "Developer mode" (toggle in top-right corner)
4. Click "Load unpacked" and select the extension folder
5. The Fisherman icon should appear in your toolbar

📖 Usage

Automatic Protection

• The extension works automatically in the background
• The icon will show a badge (! or ?) when suspicious sites are detected
• Red badge: Confirmed phishing site
• Orange badge: Potentially suspicious site
• No badge: Site appears safe

Manual Controls

• Click the extension icon to view current page analysis
• Use the popup to:
  • View detailed security assessment
  • Report false positives/negatives
  • Whitelist trusted sites
  • Manually update the phishing database

Database Management

• Access the database manager via the "Update Database" button
• Import custom domain lists (text format, one domain per line)
• Load sample data to test the functionality
• Drag-and-drop support for domain list files

📁 File Structure

fisherman-extension/
├── background.js          # Core logic and phishing detector
├── content.js            # Real-time content analysis
├── popup.html            # Main popup interface
├── popup.js              # Popup functionality
├── update-db.html        # Database management interface
├── update-db.js          # Database update logic
├── rules.json            # Network blocking rules
├── manifest.json         # Extension configuration
├── icon.svg              # Extension logo
└── icons/                # Extension icons in various sizes

🚀 Roadmap

Upcoming Features

• Cloud Synchronization: Sync your whitelist and settings across devices
• Enhanced Reporting: Detailed phishing reports with screenshot capability
• Community Database: Crowdsourced phishing domain reporting
• Advanced Machine Learning: Improved detection using AI models

Performance Optimizations

• Storage Efficiency: Address the "QuotaBytes Exceeded" error by implementing:
  • Data compression algorithms for domain storage
  • Regular cleanup of outdated entries
  • Smart caching mechanisms with automatic expiration
  • Chunked storage for large domain lists

Platform Expansion

• Firefox Version: Full compatibility with Mozilla Firefox
• Mobile Support: Protection for mobile browsers
• Enterprise Edition: Centralized management for organizations

🔧 Customization

You can extend Fisherman's detection capabilities by:

1. Adding custom patterns to PHISHING_PATTERNS in background.js
2. Importing specialized domain lists through the database manager
3. Adjusting sensitivity thresholds in the analysis algorithms

🐛 Troubleshooting

Common Issues

1. "QuotaBytes Exceeded" Error

   • Solution: The extension is working on improved storage efficiency
   • Workaround: Clear extension data and update to a smaller domain list

2. Performance Impact

   • Solution: Content scripts are optimized to minimize resource usage
   • Monitoring: Check the background process CPU usage in browser task manager

3. False Positives

   • Solution: Use the whitelist feature for trusted sites
   • Report: Help improve the database by reporting false positives

📊 Technical Details

Detection Methods

• Exact domain matching against known phishing databases
• Pattern recognition for suspicious URL structures
• Heuristic analysis of page content and forms
• Visual similarity detection for impersonation attacks

Privacy Policy

Fisherman respects your privacy:

• No personal data is collected or transmitted
• URL checking happens locally when possible
• Optional reporting sends only domain information, not personal data

📄 License

This project is licensed under the MIT License. Feel free to use, modify, and distribute with proper attribution.

🤝 Contributing

Contributions are welcome! Please feel free to:

• Submit bug reports and feature requests
• Send pull requests for improvements
• Help translate the interface to other languages
• Improve the detection algorithms

⚠️ Disclaimer

Fisherman is a preventive security tool but does not guarantee absolute protection against all phishing sites. Always practice safe browsing habits and use additional security measures for comprehensive protection.

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Note: For optimal performance, keep your phishing database updated and report any false positives to help improve the detection system.