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CloseReview for Youtube MP3 Podcaster by Kakabol
Rated 5 out of 5 stars
This is the only add-on with an actual download button, I love it.
It would be useful if you could set a default download location and default file-type. I only use it to download YouTube music in .mp3, so that would save me a click and an "Enter", but I might just be lazy :p
edit: if the video is part of a playlist, the title of the .mp3 is set to the name of that playlist. This is not that big of a deal, but some music players show the title instead of the file name. This can be confusing if a lot of the mp3's are from the same playlist.
To create your own collections, you must have a Mozilla Add-ons account.