A solid 4 out of 5, because it does what I want with the default settings, but other settings don't work—I guess YouTube and Firefox have changed since it was developed. I'm glad this extension is still available in this form. Thanks!

Does not work on Librewolf. "Open on youtube" opens the first video without the queue, and embedded player shows a configuration error. Also to note that this extension is made by an AI bro

Exactly what I was looking for ! Thank you !