Tell me the title! by Y式植林装置/ヴォルガ

Get the Youtube video title that became unavailable.
This extension will start working once you open the Youtube playlist page, such as https://www.youtube.com/playlist?list=PLWJXk4kYouBSBs073FXlFcRwmd60Bubck
You'll see buttons on the right side of every video. By clicking that you can know the title of that video.