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

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Iceggiren i YouTube Video and Audio Downloader (WebEx)

YouTube Video and Audio Downloader (WebEx) sɣur feller

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Icegger-it Aseqdac Firefox 14647467
sɣur Aseqdac Firefox 14647467, 6 jierren lyn
This is probably the best Add-on to download YouTube Videos, however, the Download button below the video got removed when I updated to the new YouTube UI(by clearing the cookies) please have an update on this one.