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How can I stop Firefox deleting my cookies on closing it down.

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With reference to the enclosed attachment, the 'delete cookies and site data when Firefox is closed' check mark is 'greyed' out and I cannot change it.

With reference to the enclosed attachment, the 'delete cookies and site data when Firefox is closed' check mark is 'greyed' out and I cannot change it.
Attached screenshots

Chosen solution

Hi IanM, You are in Permanent Private Browsing mode.

Go to: Menu -> Options-> Privacy & Security scroll down to History deselect *Always use private browsing mode

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Suluhisho teule

Hi IanM, You are in Permanent Private Browsing mode.

Go to: Menu -> Options-> Privacy & Security scroll down to History deselect *Always use private browsing mode