I was skeptical about this extension but since I love to download youtube vids specially in HD I gave it a try and I REGRET NOT HAVING THIS YEARS AGO!!! This is the best extension I have ever used. $10 is NOTHING compared to what you get from this. IT WORKS!!! TRUE!!. I'm travel within USA and Mexico and I have had no problems at all downloading vids. Forget about downloading music MP3. Download the whole music VIDEO and stream it everywhere, anytime.