For users of “Delete cookies and site data when Firefox is closed” + “Manage Exceptions”:
Use the Firefox Multi-Account Containers extension to avoid cross-site tracking.
When setting a cookie-clearing exception in Firefox it currently also disables cookie partitioning (Total Cookie Protection) for that same domain. As a result, users who intend only to preserve cookies for convenience may inadvertently weaken their privacy by allowing cross-site tracking that would otherwise be blocked by partitioning.
See 1767271 - Add a way for cookie-clearing exceptions to not also affect cookie partitioning