To use these add-ons, you'll need to download Firefox.

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Iceggiren i Youtube Downloader

Youtube Downloader sɣur Nadia Jevelyn, Vevioz Enterprise

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Icegger-it Youtube Downloader Addon
sɣur Youtube Downloader Addon, viisi vuotta sitten
Finally I found an mozilla addon which really works to download MP3 or MP4 from youtube easily, this is an excellent addon.