I regularly blow away my cache and cookies. However, I can select some to save. Which cookies related to P2K should I save so I don’t have to login again?
I do not have a P2K account, so I don’t know, which domain they use for authentication, you may look into existing cookies after log-in. Have you tried:
pushtokindle.fivefilters.org
www.pushtokindle.com
We use local storage rather than cookies, but often browsers will treat them the same. If you can whitelist pushtokindle.fivefilters.org and *.pushtokindle.com, you should be fine.