can sometimes conflict with downloader buttons. Disable other YouTube-related extensions one by one to find the culprit [19, 23]. Fix 3: Specialized Playlist Tools
If VideoDownloadHelper fails, install the (required for playlist decryption). This is the closest you’ll get to a permanent fix. youtube playlist downloader firefox plugin fix
No Firefox extension will download YouTube playlists for years without breaking. The best long-term solution is: can sometimes conflict with downloader buttons