Allegedly, on or about 05 February 2016, g sent:
something that amazes me is that with all the add-ons that have been written for cookie handling, none have a feature that ties in to url bar or bookmarks that will disable/enable cookies with out user having to make selection.
Allowing cookies for whitelisted URIs used to be a built-in feature to most web browsers. It was how I handled things for ages. Deny or ask by default, then I'd whitelist a few sites that I regularly wanted to use in a less annoying way.