Never mind, seems to be a YouTube issue, not the extension.
My previous review may no longer be relevant to this extension.
[Other than the "no internet connection" error before some videos loaded in (causing a slight delay in watching a video or listening to a playlist), it worked fine up until recently.
It now causes YouTube videos to constantly refresh (it's possible to stop the loop by pressing "X" on the top left).
It forced me to disable the extension, hoping it gets fixed (soon), as I've use it to listen to music while doing repetitive (and otherwise boring) grinding in games.]

Edit: Now it seems to work fine?
I did add the uBlock (5 second delay) fix that was apparently on YouTube's end, that may have been the cause of the issue.
I will post on GitHub if the issue returns, thanks!