Viewhance is a powerful multimedia extension for Firefox that enhances the built-in media viewer with a variety of customization options and functionalities. This free tool allows users to switch between different sizing modes effortlessly, utilize custom CSS for personalizing the viewing experience, and access a floating menu for quick actions. Users can also take advantage of features such as mouse wheel zooming and content centering to tailor their media interactions to their preferences.

Additionally, Viewhance supports advanced functions like rotating or flipping media with keyboard shortcuts, extracting frames from animated images, and handling SVG and data URIs. The extension offers native support for DASH, HLS, and MSS streaming, along with customizable media attributes, making it an excellent choice for those looking to elevate their multimedia experience on the Firefox platform.