YouTube Zoomer is a Chrome extension developed by teyzer18. This free add-on falls under the Browsers category, specifically the Add-ons & Tools subcategory. YouTube Zoomer allows users to easily zoom in on YouTube videos with a simple scroll.

The extension proves to be helpful in various scenarios. Users can utilize it to seek out specific details in a video that may be difficult to see at regular size. Additionally, it can be used to resize the format of the theater mode, providing a more personalized viewing experience.

With YouTube Zoomer, users no longer have to strain their eyes or struggle to see small details in videos. The extension's simple scroll-based zooming functionality enhances the overall viewing experience on YouTube.