This extension does exactly what is promised. I have seen zero ads since installation. I am very concerned about the permissions though. I would NEVER install this on my PC where I make financial transactions because this is a key-logger type of data retention extension. Plus they require unlimited data storage on your machine and others! The convenience of blocking ads is a minor benefit compared with the price paid in permissions granted. I keep this add-on because I only watch YouTube videos on the tablet where it is installed.