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clearing cache in private mode

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I'm running Firefox 91 on a Mac (11.5.1) in private mode with "strict" security settings. After clicking on the "clear data" button (under privacy & security/cookies and site data), Firefox gives this message: "Site Data - Your stored cookies, site data, and cache are currently using 3.6 MB of disk space." I can NEVER get below 3.6 MB of stored data. Why is this and how can I completely delete all history, cookies (incl. third party), etc.? Thank you in advance for your help.

I'm running Firefox 91 on a Mac (11.5.1) in private mode with "strict" security settings. After clicking on the "clear data" button (under privacy & security/cookies and site data), Firefox gives this message: "Site Data - Your stored cookies, site data, and cache are currently using 3.6 MB of disk space." I can NEVER get below 3.6 MB of stored data. Why is this and how can I completely delete all history, cookies (incl. third party), etc.? Thank you in advance for your help.