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Why won't firefox delete my history searches and cookies and cahce when I click clear history?

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There's a yellow triangle with an exclamation mark in the middle and it says "All items selected will be cleared. This action cannot be undone" when I try deleting everything in the clear history tab.

There's a yellow triangle with an exclamation mark in the middle and it says "All items selected will be cleared. This action cannot be undone" when I try deleting everything in the clear history tab.