This is my most important Add On Extension. I am constantly using videos and music from YouTube in various applications, and now you can't download videos or music unless you are a PRO user. This takes care of that. Love it! By the way, for some reason, probably me cleaning up files, it stopped working. My inquiry was answered within about ten minutes, steering me to what might be going on, and sure enough, they were right, and I was back up in a jiffy, able to download the content I needed. Thanks for the quick response!