Web Text Highlighter Extension

A browser extension that allows you to highlight text on web pages, organize highlights by categories, and export them for later use.

Features

• 🎨 Custom Colors: Choose any color for your highlights
• 📂 Categories: Organize highlights (Important, Study, Quote, Reference, Todo)
• 💾 Persistent Storage: Highlights are saved and restored when you revisit pages
• 🔍 Search & Filter: Find highlights by text or category
• 📤 Export: Download all highlights as readable text file
• 🎯 Easy Management: Double-click highlights to change color or remove
• 🔒 Privacy First: All data stored locally, no external servers

Installation

1. Download or clone this repository
2. Open your browser and go to chrome://extensions/ (Chrome) or brave://extensions/ (Brave)
3. Enable "Developer mode" (toggle in top right)
4. Click "Load unpacked" and select the extension folder
5. The extension is now installed and ready to use

Usage

Highlighting Text

1. Select any text on a webpage
2. Right-click and choose "Highlight as..." → Select category
3. Text is highlighted with your chosen color (semi-transparent)

Managing Highlights

• Change Color: Double-click any highlight → Click color square
• Remove: Double-click any highlight → Click red X button
• Set Default Color: Click extension icon → Use color picker

Viewing & Exporting

• View All: Click extension icon to see all highlights
• Search: Type in search box to find specific highlights
• Filter: Click category buttons to filter by type
• Export: Click "Export Highlights" to download as text file

File Structure

web-notes-highlighter/
├── manifest.json          # Extension configuration
├── background.js          # Context menu handler
├── content.js            # Main highlighting functionality
├── popup.html            # Extension popup interface
├── popup.js              # Popup functionality
├── styles.css            # Highlight styling
├── recover.html          # Data recovery tool
└── README.md             # This file

Security Features

• Content Security Policy prevents code injection
• Input sanitization prevents XSS attacks
• Data validation ensures safe storage
• Local storage only - no external data transmission
• Minimal permissions requested

⚠️ Security Warning

DO NOT use this extension on untrusted or suspicious websites.

Safe: Educational sites, documentation, news, research papers
Avoid: Suspicious sites, excessive ads, unknown domains

Why: Malicious websites could interfere with extension functionality or attempt to exploit browser vulnerabilities.

Use only on trusted websites for study and research purposes.

Browser Compatibility

• ✅ Chrome (Manifest V3)
• ✅ Brave
• ✅ Edge
• ✅ Other Chromium-based browsers

Privacy

This extension:

• Stores all data locally in your browser
• Does not send any data to external servers
• Does not track your browsing activity
• Only accesses pages where you actively use highlighting

License

MIT License - Feel free to modify and distribute

Contributing

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Test thoroughly
5. Submit a pull request

Support

If you encounter issues:

1. Check browser console for error messages
2. Try reloading the extension
3. Use the recovery tool (Extension options → Recovery)
4. Create an issue on GitHub