Unfortunately, the extension is incompatible with the Dearrow extension, which is VERY unfortunate, since it is one of my favourite YouTube extensions. It is also quite buggy - it often just straight up doesn't load any videos and I am forced to disable the extension. I tried getting help with this problem last year, but I still didn't get a response. One of the only advantages of this extension over YouTube Redux is that it actually does change the video UI.