Most flawless working video downloader that I tried (and I tried all of the recently most popular in Firefox addons). The only problem was with finding and downloading the Native app (go to their homepage - ant.com). It won't appear automaticly as a shortcut (just click your extensions list), so it's maybe too complicated for some people. But it works perfectly.

¡Muy bueno! Pude descargar vídeos muy valiosos de una web donde no funcionaba el famoso "Video DownloadHelper" ¡Enhorabuena y mil gracias! ¡Viva Brasil o Portugal! (no sé de qué país de lengua portuguesa sois) (Sólo eché de menos una interfaz más intuitiva para gestionar las descargas interrumpidas)