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Why I can not clear form and search history on Mozila Firefox v39.0

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Every time I go to clear my history, every check box is checked except form and search history check box. Please help me. Look at the picture below.

Every time I go to clear my history, every check box is checked except form and search history check box. Please help me. Look at the picture below.
Attached screenshots

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because there is no data on Forms and search history. you already clear that.