Is there a way to remove all cookies, on shutdown, of any websites not pinned? Manually adding websites to the exception list isn't straightforward since some websites saves multiple cookies from different domains.
I'm looking for a solution for either Chrome/Chromium or Firefox.
To see what cookies a particular site sets, the View Cookies Firefox Add-On can help. That or just open the sites you want to pin one at a time to see which cookies get set. Then pin them all and set your cookie policies. From there, you can go back to manually whitelisting or use the Cookies Manager Plus Add-On to do it for you. For example, I've used these in the past to identify and whitelist the Google two-factor authentication cookie that remembers you for 30 days, while still deleting all other cookies when I close Firefox.
Use Biscuit extension for Firefox. It allows you to select which cookies you want to preserve, so when Firefox closes, it deletes only the cookies not protected.
