Better than the others Puntuado con 4 de 5 estrellas
I've tried at least one other similar addon. DownloadHelper is much better. This addon works on youtube as well as other websites. It tells you when you can download with its small animated icon.
Pros: It works well and is easy to use. The developers even update the addon (eventhough I haven't seen any errors).
Cons: Sometimes there are multiple files to choose from which is odd. Otherwise the program would be flawless.