If you are looking for the lowest video-jitter, browsing youtube, or internet-animations generally, chromium is the best browser. Ofcourse on standard configs of linux, or stock windows, jitter is far from optimal, and the difference little. On an optimized system though, for timing accuray (low jitter) the difference is noticable. Probably more on older systems.
Look at my engineering page, for info and guides on low-jitter.
Peace BE With You.