Nadia
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This allows Mozilla browser users to download and convert YouTube videos to mp3 (320) kbps files and also videos with a variety of high quality options 2160p (4k), 1440p (2k), 1080p (HD), 720p (HD), 480p, 360p, 144p etc. This video quality is supported for all available video formats (MP4, WEBM, 3GP).
Youtube Downloader – Get this Extension for 🦊 Firefox (en-US)
Download Youtube Downloader for Firefox. Please play the video on youtube then click the icon in the top right tab to download mp3 or videos. Note: This add-on will direct the user to a downloader website to download the video or mp3 of your choice from youtube.