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Why Disable content selection is not working ?

Actually your theme doesn't have <?php wp_footer(); ?> in footer, so please edit the footer of your theme and insert that code. To edit the theme go to Design >> Theme Editor >> Select "Footer.php" from right hand list >> and paste <?php wp_footer(); ?> just before the '< /body >' tag. If possible add this code near to Wordpress link. The "disable Content selection" will start working.