Second Sun is a Chrome extension developed by Gratatat that aims to protect your eyes while watching videos. This free add-on falls under the category of Browsers and specifically the subcategory of Add-ons & Tools.

The main purpose of Second Sun is to provide a "dark mode" experience for lectures, talks, and videos. When the extension is loaded, it performs a search per page for video elements. It then attaches a toggle button and canvas to the video player, providing a customizable viewing experience.

The attachment details of the canvas vary depending on whether the player is recognized (such as YouTube) or not. Each video frame is subjected to image manipulation and displayed on the canvas driven by WebGL, resulting in a visually optimized experience.