Nice of them to run these benchmarks, but a little better analysis would be nice. Like the Oort Online test. Chrome got 9960 and Firefox "left it in the dust" with 10,000. That's 0.4%. The difference in frame rate would be 59.76 fps vs 60.00 fps if the results are translatable.
Also, I doubt their results are generalizable across all computers. I just ran the peacekeeper benchmark on all three browsers on my laptop and chrome won.
Me: Chrome: 3191, Firefox 2908 (-283), Edge 2158 (-1033)
Them: Firefox 4655, Chrome 4325 (-330), Edge 3091 (1564)
Just take all benchmark results with a grain of salt, especially ones where all are withing 1% of each other. Saying "Edge won 4 out of 8 benchmarks" is virtually meaningless.