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Unable to Clear Cookies and Site Data and unable to uncheck Delete cookies and site data when Firefox is closed.
I have tried to Clear Cookies and Site Data repeatedly in Standard, Strict and Custom modes with no success and repeated that test when trying to uncheck Delete cookies and site data when Firefox is closed. Incidentally this problem began occurring when Firefox offered me the opportunity to use DNS Over HTTPS. I Like using DNS over HTTPS although it may very well be that hackers and info miners (Phishing) do Not like this new firefox setting and have adjusted their cookies into Permanent SOLs. Google hires hackers for many things. How can you help me you ask? Please repair the problem.
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Note: Some software, like Advanced SystemCare with Surfing Protection, can protect files in the Firefox profile folder against changes. If you have such software then check the settings or uninstall this software.
Make sure you do not run Firefox in permanent Private Browsing mode (Always use Private Browsing mode; Never Remember History).
- Options/Preferences -> Privacy & Security
Firefox will: "Use custom settings for history"
- remove checkmark: [ ] "Always use Private Browsing mode"