Chrome versus Firefox

[danielheller]

Website http://artgreet.com

Testing this website with Chrome https://www.webpagetest.org/result/170224_GR_SM7/
First view 3.293s / First byte 1.591s LONG HTML BAR!
Second view 2.058s / First byte 0.233s
Third view 2.038s / First byte 0.241s
On every single test the First view results in an "F" (First Byte Score)

Testing this website with Firefox https://www.webpagetest.org/result/170223_ZR_743/

The results of all views are very similar. There is no such big difference between the First and subsequent views like it is with Chrome.

Anyone has an explanation for this?
Thank you