These are stupid benchmarks and chrome devs stopped optimizing after them [1] because they don't matter. Michael (the phoronix guy) makes a living out of automating benchmarks and automated feed aggregation (or mailing lists) and those benchmarks especially add nothing of value to the Browser speed discussion.
Well, for now it is still much slower than Chrome https://www.phoronix.com/scan.php?page=article&item=firefox-...