PocketTube: YouTube Playlist Manager is a Firefox extension designed to streamline the organization of YouTube playlists. It offers features such as grouping playlists into custom nested folders based on topics, filtering videos by duration and watched status, and removing watched videos with a single click. Users can also sort playlists by video count, views, and last updated, enhancing the overall management experience.

This extension is particularly useful for avid YouTube users, allowing for multi-selection of videos for various actions like saving to playlists or marking as watched. Additional features include keyboard shortcuts, search functionality, and a playlist length calculator. PocketTube integrates seamlessly into the YouTube interface, making it a valuable tool for both casual viewers and dedicated playlist curators.