Thanks for reaching out. I see this behavior too. My extension works, Youtube was broken. Creating a playlist by the link is not working now: https://www.youtube.com/watch_videos?title=Playlist&video_ids=huTUOek4LgU It is sad:( Lets waiting for some hours, I think they will be fixed this issue. If it is not, I will search for an alternative way to create this link. Our apologies for this inconvenience.

UPD: I added some fixes for this issue. Try now version 7.0.4
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