CSS Class Remover Chrome Extension

A lightweight Chrome extension that automatically removes specific CSS classes (test-item-child and blur) from div elements on user-specified websites.

Features

• 🎯 Targeted Removal: Removes only test-item-child and blur classes from <div> elements
• 🔄 Real-time Monitoring: Uses MutationObserver to handle dynamically added content
• ⚙️ Domain Management: Simple interface to add/remove allowed domains
• 🚀 Performance Optimized: Debounced operations and efficient DOM queries
• 🔒 Secure: Manifest V3 compliant with minimal permissions
• 💾 Persistent Settings: Domain preferences saved to Chrome storage

Installation

1. Download/Clone this repository
2. Open Chrome and navigate to chrome://extensions/
3. Enable Developer Mode (toggle in top-right corner)
4. Click "Load unpacked" and select the extension folder
5. Pin the extension to your toolbar for easy access

Usage

Setting Up Domains

1. Click the extension icon in your toolbar
2. Click "Open Settings" or right-click the icon and select "Options"
3. Enter domains in the text area (one per line):

   example.com
   subdomain.example.org
   another-site.net
   

4. Click "Save Settings"

Quick Domain Addition

1. Visit any website you want to enable the extension on
2. Click the extension icon
3. Click "Add Domain to Enable" to quickly add the current site

Verification

• The extension icon shows the current status
• Green status = Extension is active on current site
• Red status = Extension is not active on current site

Technical Details

Files Structure

css-class-remover/
├── manifest.json          # Extension configuration
├── content.js            # Main functionality script
├── options.html          # Settings page
├── options.js           # Settings page logic  
├── popup.html           # Extension popup
├── popup.js            # Popup functionality
└── README.md           # Documentation

Key Features

• Manifest V3: Uses the latest Chrome extension standard
• Minimal Permissions: Only requests storage and activeTab
• Debounced MutationObserver: Efficient real-time DOM monitoring
• Domain Validation: Ensures proper domain format
• CSP Compliant: No inline scripts or unsafe practices

Browser Compatibility

• Chrome 100+: Full support
• Edge 100+: Full support (Chromium-based)
• Other Chromium browsers: Should work with manifest V3 support

Development

To modify or extend the extension:

1. Edit the source files as needed
2. Reload the extension in chrome://extensions/
3. Test on target websites

Adding New Classes

To remove additional CSS classes, modify the TARGET_CLASSES array in content.js:

const TARGET_CLASSES = ['test-item-child', 'blur', 'your-new-class'];

Troubleshooting

Extension not working?

• Check if the current domain is in your allowed domains list
• Reload the page after adding a new domain
• Check the browser console for any error messages

Performance issues?

• The extension uses debounced operations to minimize performance impact
• Consider reducing the number of monitored domains if issues persist

Privacy & Security

• No data is sent to external servers
• All settings are stored locally in Chrome storage
• No access to sensitive page content beyond removing specified classes
• Minimal permission requirements

License

This extension is provided as-is for educational and practical use. Feel free to modify and distribute according to your needs.