This report is about removing optional user control over which cookies get created. Firefox 44 still allows users to delete individual cookies. Open up Preferences, go to the Privacy tab, click on "remove individual cookies" (a hyperlink) and you will see a list of all your cookies, grouped by domain name. Click on the ">" before a domain name to see the cookies for that domain. Select and delete as desired.
Personally, I prefer to use NoScript but allow websites to create cookies. That way I can whitelist domains in NoScript until a website works, without having to worry about which cookies to allow. Once I've finished with a website, I can always delete all the relevant cookies until next visit. This works well for me; YMMV.