I've tried deployed or even upgrade my foundation from the older version to 3.1 and it seems that the same issue still happen on firefox.
Best answer by bezeddin
Have you follow https://portal.nutanix.com/#/page/docs/details?targetId=Field_Installation_Guide-v3_1:Field_Installation_Guide-v3_1 ?
I found same issue regarding Foundation upgrade to 3.1 and 188.8.131.52
Solved by putting Gateway IP on /etc/sysconfig/network-script/ifcfg-eth0