Just tried that. Page is still shaking, but I’m noticing two interesting behaviours:
1. Page shakes when it’s initially loaded and the mouse is hovered over its place in the menu bar, then stops after a second.
2. From there, page only starts shaking when any mouse button is clicking down on an item in the menu bar.
From what I can see, the specific issue is that it’s hiding and unhiding the browser’s scroll bar rapidly, giving the illusion of the page shaking. Maybe this will help in some way.