What are your current cookie settings that makes it necessary to create an allow exception ? Are you blocking all cookies ?

You can only set an exception for an origin (protocol and hostname) and not for a top level domain. You can consider to setup an extra profile that has these cookies enabled by default so you wouldn't need an exception.

I'm using the default "strict" "Browser Privacy" settings. I notice that most websites aren't keeping me logged in. They are also not saving my preferences like they did before.

I already have and use multiple profiles. For convenience sake, I'm not going to create yet another one. I use my main" profile for managing servers on my home network, since I'm on them every day and need quick access , another profile would slow me down quite a bit.

I am researching other browsers to see if I can find one with multiple profiles and lets you whitelist TLD's and ipv4/v6 subnets. Those features would make life a lot easier for me!