Youtube Volume Scroll is a subscription-based Firefox extension designed to improve the user experience on YouTube by providing enhanced volume control features. It allows users to adjust the volume by scrolling, with the new volume level displayed on the video for one second after adjustment. Additionally, the extension remembers the volume settings even in incognito mode and works seamlessly with embedded videos from various platforms such as Reddit and WhatsApp.

This extension also includes options for customizing the volume scroll 'steps' and overlay style through the extension icon. Another notable feature is its ability to automatically block the 'Continue watching?' popup that can interrupt viewing sessions. Users are required to grant access to their data for specific YouTube domains to enable these functionalities.