Welcome to Firefox Add-ons.
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About this Add-on
-discover new songs, videos and artists
-save easily what you love in playlists
-get automatically videos from channels
Have an entertaining time, try Y++.
To create your own collections, you must have a Mozilla Add-ons account.
To many people are asking simple questions like "How to add a video" or "how to create playlists". So, these data will help me understand the problem.