Thanks for a nice extension. Is there any way to hook into History - Clear Recent History, so if you delete your complete history including cookies through Firefox itself, you can still preserve the whitelisted domains? Prior to Firefox 57, I used an extension called biscuit that supported preserving certain cookies, so when you cleared your browser history, you could delete all your cookies except certain cookies that you flagged - https://addons.mozilla.org/en-US/firefox/addon/biscuit-220876.

Alternatively, could a menu option be added that clears your complete history for everything but cookies, and then does the cookie delete through Cookiebro, not removing the whitelisted cookies?