The new "Hide Thumbnail" tweak should fix the problem, at least on your 1080 machine. I'm 1280x1024 on my monitors here at home, and after the feature was added, while the page DID refresh, it didn't have to shift the page up because the main photo was already in the viewing area.
But yes, if you don't have your browser maximized, that will definitely have an affect, since web pages are not capable of being "fluid" in the vertical direction. I always maximize my browser windows, but that's just a little OCD tick of mine. I can't fucntion in a window that doesn't maximize to the screen