YouTube Thumbnailer is a free Chrome add-on developed by Kazuma Ito. As an add-on in the Browsers category, its main purpose is to display a thumbnail image of the video being played in the video description on YouTube. With this add-on installed, users can easily see a preview of the video content without having to click on it.

Upon installation, YouTube Thumbnailer seamlessly integrates into the YouTube interface. When watching a video, the add-on automatically fetches the thumbnail image and displays it in the video description section. This feature allows users to quickly get an idea of the video content and decide whether they want to watch it or not.

The simplicity of YouTube Thumbnailer makes it a handy tool for YouTube enthusiasts who want to save time and avoid unnecessary clicks. By providing a visual representation of the video content, it enhances the browsing experience and helps users make informed decisions about which videos to watch. Install YouTube Thumbnailer today and enjoy browsing YouTube with ease.