Http://download.cnet.com/YouTube-Downloader/3000-2071_4-10647340.html incearca asta. la mine merge
La mozilla\unelte\suplimente\suplimente\scrii downloadhelper\adauga la firefox\instaleaza...la orice videoclip vizualizat, deasupra stanga, apare o pictograma animata\clic pe ea si descarci videoclipul.
Le poti descarca fara nici un program sau site. Uite aici cum:
http://imperfect-blog.blogspot.com/......pe_07.html