Enhancer for YouTube volume scroll no longer working

I’ve been using Watch2Gether for years now, and for the last year or so I’ve also been using the Firefox add-on “Enhancer for YouTube”. It has a feature that allows you to control the volume of the video using the scroll wheel on your mouse while your cursor is over the video. This feature has worked while using Watch2Gether for the last year, but as of maybe ~2 weeks ago, I am no longer able to control the volume of the video using the scroll wheel. I’m not sure if the issue is linked to this, but it started happening around the same time I noticed the “copy link” text in the top right of the video player window. Is it possible that there is an additional element on top of the player that prevents this add-on from working?