Video DownloadHelper is fantastic. Here's why: Puntuado con 5 de 5 estrellas
Because I'm using NoScript, Adblock Plus and Flashblock all at once, no video download extension managed to work in my Firefox until I found Video DownloadHelper which managed to overcome those obstacles and smoothly operate and do the job right!
The interface makes things easy and to the point.
For anyone that likes to save those web-based videos, this extension is a gem!