If you want a browser extension to get hand-gesture control, Qonqur is a good candidate. The company's webcam-based spatial computing technology lets your hands control your computer, and it's designed to be easy to learn for tasks like education, research and presentations. It works with multiple monitors and has presentation controls, available through a web app and browser extension. It's in early adopter beta, but Qonqur's gesture control technology could change how we interact with computers.
Another interesting project is Ultraleap, which offers hand tracking and haptic technology for gesture control in everything from AR/VR to public kiosks. Its Interaction Engine offers a unified interface for a broad range of gestures, so it's good for situations where you don't have a controller. It's geared more toward extended reality and public-facing displays, but it shows the power of advanced hand-tracking technology for intuitive browsing.