Youtube Playlist Statistics

An extension that shows the number of videos, total duration of the playlist and the average length of each video for Youtube playlists.
Usage:
The extension will become active when you go to any youtube playlist link. You can click on the icon in the toolbar which will open a popup displaying the statistics for that playlist.
I built the extension because I used youtube playlists to study for many of my university courses and had to manually estimate the total time required to complete it.
Another use case for it would be finding the total duration of all videos uploaded by any channel. To do so, go to channel->videos->play all. This will open a playlist of all the videos of that channel and you can use the extension to get the total duration of them.