You can install the Open With add-on and configure it to send playlist URLs directly to a command-line tool like yt-dlp. This is often the fastest and most reliable way to download hundreds of videos at once.
Because of the restrictions in the official Mozilla store, the ecosystem has shifted. The best solutions often fall into three categories: reputable third-party extensions, browser integration helpers, and "exploit" scripts. youtube playlist downloader firefox plugin
The "OG" of media downloaders, Video DownloadHelper is one of Firefox’s most popular extensions. It can detect multiple videos on a page, making it useful for capturing segments of a playlist directly within the browser. You can install the Open With add-on and
Extensions were identified via the official Firefox Add-ons store and third-party repositories. Criteria included: support for playlists, format options (MP3/MP4), download success rate, update frequency, and user reviews. The best solutions often fall into three categories: