3 stars until I test it on normal videos and then on live videos tonight to see exactly how much bandwidth is saved. After installation, I do see YouTube showing the video and the ads are blocked. If the app limits 1 hour of YouTube streaming data to 200mb or lower I will change this to 5 stars. Edit: It's under 200mb but when I got back home and my phone automatically switched to WiFi it froze up YouTube and I had to restart the phone entirely to get YouTube to work again with the extension.