: Some users have noted that it may use significant computer memory during processing. It does not guarantee support for every website, especially those using non-mainstream or protected playback technologies like RTMP. Video Downloader Professional/Plus - MPMux Firefox Add-On
Navigate to the page containing the video you want to save. The MPMux icon in your toolbar will typically change color or display a notification when it "sniffs" a media file. Video Downloader Professional Plus - Mpmux Firefox