Happened to me as well. At first, I thought it was because of the VPN I used to reroll my accounts, but that wasn't the case. My second thought was a maintenance that caused the crash, but it seemed too early for that.

I just uninstalled Avast after the warnings basically popped up at literally every site I went to on chrome, opera, etc. Installed Avira (or another free antivirus software) after that and it hasn't bothered me since then. Played KamiPro smoothly after all that. Looks like Kamihime triggered something and caused Avast to go haywire on all browsers. No idea why.