It could have been removed. https://addons.mozilla.org/en-US/firefox/addon/betterprivacy/?src=cb-dl-users BetterPrivacy-signed by IKRG This add-on has been removed by its author. I did find this; https://www.bing.com/search?q=Firefox+better+privacy&qs=n&form=QBRE&sp=-1&pq=firefox+better+privacy&sc=4-22&sk=&cvid=506AE2828EBD4CE8A3B553CA67B197CE

The Better Privacy extension let you manage Flash Local Storage Objects (LSO's) sometimes called supercookies. Adobe has some pages to let you view and delete them. A little less convenient but depending how many you are accumulating, this may be good enough? Flash needs to be allowed on the pages for the storage manager dialogs to work: '''''General Storage Settings''''' http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager03.html '''''Site-Specific Storage Settings''''' http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager07.html (Macromedia is the company that originally developed Flash, and it was acquired by Adobe a long time ago, so that server is legit.)