I am looking for a simple Firefox extension to blacklist 1st-party cookies from user-specified sites (well, actually domains or hosts).
Firefox uses the 'site' terminology a bit incorrectly, but since that's the terminology used by the browser, we won't worry about it for this question. It's perfectly acceptable if the blacklist must be specified at either the domain or the host level.
The extension must be able to withstand the user clearing Site Preferences (which can be cleared via Ctrl+Shift+Delete).
Note that Cookie Controller and Cookie Monster are not currently able to meet this requirement.
The cost should be gratis or about what a milkshake costs. Open-source is preferred but not required.