Seems to be okay for me on FF 129.0.2 + uBlock Origin, running on Windows 11.
Looking through the Reddit comments, users running older versions of FF may be affected? Seeing a few people commenting that they're seeing this YT issue with v88, 110, 115 ESR and 121.
i am using the ESR version and the slowness definitely exists here.
The slowness accumulates after the infinite scroll loads a lot (e.g., the subscriptions page or the home page, or comments). Refreshing fixes it, but now you've lost the old position and have to re-scroll back (which, causes the slowness once again).
Same here, with the caveat that Google has managed to successfully bully me into paying for Premium some time ago. Not sure if any Premium users are affected.
Looking through the Reddit comments, users running older versions of FF may be affected? Seeing a few people commenting that they're seeing this YT issue with v88, 110, 115 ESR and 121.