First, why are you keeping cookies in the first place?
Install Forget Me Not and deny/whitelist/clean up cookies automatically. I deny all cookies, except the ones I need to login to a few sites. Another way to go about it, is to just automatically delete all cookies when you close a page.
Secondly, why aren't you using Temporart Containers?
Each domain gets it's own temporary container and there is no cross contamination. Close the page and it's all gone.
