...Add the sites you want to keep cookies for to the whitelist (permanently) or greylist (until browser restart) Enable "Automatic Cleaning" in settings or "Auto-Clean" in popup. Watch those unused cookies disappear. Please keep in mind that at this time only Mozilla Firefox and Google Chrome (as well as its development branches e.g. Developer Edition, Canary) will be supported. Microsoft Edge Chromium will be considered partially official as it is using the same code as Google Chrome for now.