Hello,

You have to enable the option " Clear History when Firefox Closes" Then click the "Settings" Button.

Now you can select the option you want.

Further information can be found in the How to clear Firefox cache article here https://support.mozilla.org/en-US/kb/how-clear-firefox-cache

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Thank you.

Your System Details list shows that you run Firefox in permanent Private Browsing mode and thus all cookies automatically expire when you close Firefox.

• browser.privatebrowsing.autostart: True

• https://support.mozilla.org/kb/Private+Browsing

• Tools > Options > Privacy > Firefox will: "Use custom settings for history"
• Deselect: [ ] "Always use private browsing mode"