I really liked the idea, but the layout jumping during initial page load (used the Firefox version) was really annoying me so much, I had to deactivate it again.
Hi, thanks for using the extension. The "jumping" of the layout is probably due to the insertion of the options bar on the top. You can change this setting to position it on the bottom instead in the extension's popup window (it has a a lot more settings which you can tweak around to customise your experience).
This issue is also addressed here: https://github.com/plibither8/refined-hacker-news/issues/25