I can't feel any difference between Chrome and Firefox when scrolling, but http://www.vsynctester.com/ http://www.vsynctester.com/ is jankier on Firefox on my o

I can't feel any difference between Chrome and Firefox when scrolling, but http://www.vsynctester.com/ http://www.vsynctester.com/ is jankier on Firefox on my old-ish Macbook Air.