Does your /button/ scroll, or does your /scroll wheel/ scroll. Important difference. With middle-mouse-button-scroll enabled, clicking the middle mouse button somewhere other than on a link will create a small circle with two arrows in it, and then you can drag the mouse to scroll vertically or horizontally (similar to pinch and drag on touch screens). This is the button-scrolling I was talking about, and from my experience it does not come enabled on Chrome (but I may be remembering wrong, it’s been a while since I set up Chrome configs, and for inexplicable reasons I remember this varying across OSes for both Chrome and Firefox last I checked)
