### Added
- Firefox compatibility with browser_specific_settings
- Proper extension ID for Firefox Add-ons
- CHANGELOG.md file for version tracking

### Changed
- Updated manifest.json structure for Firefox compatibility
- Updated minimum Firefox version requirement to 58.0
- Updated Firefox add-on ID to match AMO ID
- Removed persistent flag from background scripts

### Added
- Customizable export settings
- Additional export formats support
- Custom XPath configuration interface
- Auto-detection for chat interfaces
- Export history tracking functionality
- Settings page for user customization
- Search functionality in exported content
- Proper TypeScript support
- Unit tests for core functionality
- Code quality checks (ESLint, Prettier)
- Detailed API documentation
- User guide with examples
- Contribution guidelines
- End-to-end tests
- Cross-browser compatibility improvements
- Performance optimizations
- Security enhancements

### Changed
- Improved XPath selectors for better content detection
- Enhanced error handling for failed content extraction
- Updated extension icons and branding
- Refined support for different chat interfaces
- Improved code documentation
- Implemented proper testing infrastructure

### Fixed
- Various bug fixes and performance improvements
- Enhanced stability across different browsers
- Improved error handling and user feedback