https://arstechnica.com/gadgets/2021/08/todays-firefox-91-release-adds-new-site-wide-cookie-clearing-action/

Mozilla's Firefox 91, released this morning, includes a new privacy management feature called Enhanced Cookie Clearing. The new feature allows users to manage all cookies and locally stored data generated by a particular website—regardless of whether they're cookies tagged to that site's domain or cookies placed from that site but belonging to a third-party domain, eg Facebook or Google.