I don't really want to disable storage or ALL cookies. But I DO want to COMPLETELY sanitize on shutdown. While this policy is effective AND network.cookie.noPersistentStorage in config has been set True, NEITHER stops Persistent Storage nor cleans it. ONLY manual cleaning (deletion) of persistent storage is available in Settings: Privacy & Security: Manage browsing data. There is no other option available that I can find. One solution suggested a setting that both disallowed cross-site cookies AND isolate other cross-site data but there is no setting like that. There are TWO separate settings for that. Besides, that is not what is wanted. How can I either completely disable persistent storage - or, more preferred is to completely clear persistent storage upon quitting?! I have everything else cleared on quitting but persistent storage is indeed persistent. If I have to, I will disable it completely (not preferred) but do NOT want to disable ALL storage use. Why doesn't network.cookie.noPersistentStorage not work? Or, if it does, what does it actually do? I would like a policies.json entry for this as I already employ the file in /etc/firefox/policies as described. This is the preferred method for multiple users. I am using Ubuntu and Firefox Snap for Ubuntu 149.0.2 (64-bit). Let me know if other information is needed. Thank you.