Hi Man. I really want to use this because the YTM music videos are really distracting but Spotify keeps saying there was an error so I can't actually use the extension. I don't know how to contact the developer and there's no other extension like this. I tried with 2 Spotify accounts and both said an error hours apart. Please let me know if there's a fix or maybe its a problem on my end. If not totally fine, I would give 5 stars if Spotify would connect.

EDIT: Just my luck seeing the developer reply on March 9th. Thank you for the reply, the extension isn't working for me just like you said haha. At first it connected to YTM (and I was hopeful) but there was just no video playing and a blank screen then I refreshed and it automatically disconnected and now it won't connect at all and the music video is shown again. If anyone's reading this because they want to use the extension and don't have premium you could ask a friend to use their Spotify premium account.
And to the developer, sorry about the change in Spotify rules I'm sure its a great extension.