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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
yt-dlp is the best tool out there, and you can find plenty of GUI for it out there, for free. Don't use bullshit extensions like this one.
Any extensions that can somehow run yt-dlp?