Hide Funimation UI is a Firefox browser extension designed to improve the viewing experience on Funimation by allowing users to hide the video UI while watching content. The extension offers a simple solution to the common issue of the video interface remaining visible when paused. Users can easily press 'z' to toggle the UI visibility, enhancing focus on the video content.

In addition to UI management, the extension provides intuitive navigation controls. Users can seek backward and forward in 1-second increments using the up and down arrow keys or the PgUp and PgDown keys. This feature was updated in version 2 to prevent conflicts with the native controls of the new Funimation player, ensuring a seamless viewing experience.