Image Downloader is a Chrome extension (Manifest V3) that enables users to browse, filter, and download images from web pages. The extension features a popup UI, side panel, and options page for configuring download behavior. It uses Preact with Signals for state management, Tailwind CSS for styling, and includes sophisticated image processing capabilities like deduplication, resolution-based filtering, and format detection. The architecture consists of a background service worker handling downloads, content scripts for image discovery, and multiple UI interfaces (popup, side panel, options). Key strengths include well-isolated reusable components for image deduplication and discovery, comprehensive test coverage, and modern build tooling with Bun.