Assuming you follow the API key instructions, the app works about 40% of the time. The countdown before sampling begins is frustrating, and should be configurable. The wide bar interface is cumbersome and should be reduced to a small window similar to the Spotify extension on chrome. The most major issue is the audio stream hijacking, where the audio of subsequent videos will be inaudible after the song identifier was used on a previous video. A page reload is necessary to remedy this, which should not be the case. The accuracy of the API aside, this extension is very rough around the edges, but shows some promise.