Hand.js is a Chrome extension developed by darko.juric2. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. This free extension allows users to control sites using hand gestures, such as YouTube and Google Slides.

With Hand.js, users can easily play or stop videos on YouTube, as well as advance to the next slide on Google Slides, simply by raising their hand. Once the extension is installed, a small popup icon will be displayed on the page, indicating that it is ready to be used.

It's worth noting that while Hand.js requires access to your camera, the data captured is only used locally and is not transmitted in any way. This ensures the privacy and security of the user's information.