I'm not sure uBlock Origin is compatible with Firefox. It isn't listed among the available add-ons, and I lost many of my earlier features (Samfind, Google image search, etc.) when Firefox 57 came on the scene and they were suddenly pronounced incompatible and had to be replaced with Firefox-friendly alternatives.
I'm simply disabling Ad Block only on this site, and that works for me. The ads on this site actually add color and beauty to the pages and never jump around or make noise.
Incidentally, Ad Block most definitely was the reason my thumbnail and acorn numbers disappeared. I re-enabled Ad Block to make sure, and all of the numbers were gone. As soon as I disabled it, they came back.