In my opinion this down loader is by far the best. I have tried all others but they never worked as good as this add-on for Firefox. You get sharp clean videos and audio from this add-on.The best thing about this down-loader is that you choose the quality of the videos. I would give this add-on 100 thumbs up if I could. Thanks Dishita for working so hard to keep up with the YouTube changes to keep this add-on working.