RHEL 8.4: after updating firefox some/most website won't load/work

Hello,
On a rhel 8.4 workstation, after updating firefox from firefox-78.11.0-3.el8_4.x86_64 to firefox x86_64 78.12.0-1.el8_4 with yum, some/most sites won't work. (I wonder if it is https vs http but not sure, I use some internal apache servers for testing.)

Does anyone know what is the reason for that?

thanks,

Ron