Gigablast twice as fast downloading using Firefox instead of Google Chrome

I get about 450 mbps downloading using Gigablast using Google Chrome and Cox speedtest.html

I get about 840 mbps downloadng using Gigablast using Firefox and Cox speedtest.html

I hope that this helps others as I try to figure out why the huge drop in performance with Chrome.
I have uninstalled and reinstalled Chrome and get the same results. No browser extensions.