[zzleeper]

Another data point: on Windows I get 60 fps on both Chrome and FF

[tokyodude]

That would arguably mean your machine is fast enough to get 60fps since the browser basically throttles to 60. So a slower machine would show the difference but an even faster machine would still show 60

[justwalt]

In my experience, FF performance is much better in Windows than in Mac or Linux, unfortunately.