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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
Regarding point 1. that's what HLS does. The extension simply generates a simple to use CLI command to request and compile the HLS stream into a normal video file. Simply sniffing out the video source via the network manager is just the first step and most simple step of the process.