I can see the usefullness of this tool but it's not clear how to use it. I installed it but nothing changed (i.e. there's no button in the toolbar). I tried restarting Chrome hoping to see some changes, nothing. I went to the extensions settings page but all I see are checkboxes for different see screenshot: http://imgur.com/rOBCMmj

It would be extremely helpful to have even a basic tutorial page/link pop up after installation (you can add this hook in the manifest.json).