PhotoShow is a Chrome extension that allows users to view high-definition images by hovering the mouse over thumbnails on various websites. It supports over 140 websites, including popular ones like Amazon, Facebook, Google, Wiki, and YouTube. The extension provides hotkeys for various commands, such as rotating images and scrolling, and allows users to customize settings like website toggles and activation modes. PhotoShow does not collect personal data and does not hold responsibility for any consequences resulting from the use of downloaded resources. Users can provide feedback and request additional website support through email or Github.