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Video DownloadHelper Firefox extension puts a giant QR-code on converted videos and charges $30 to remove it.
(www.downloadhelper.net)
A place to discuss the news and latest developments on the open-source browser Firefox
Anything that uses youtube-dlp, so this one for example: https://github.com/StefanLobbenmeier/youtube-dl-gui
Better too because it's not running as a browser extension.