How To Add Font Size Dropdown To WordPress 3.9 Visual Post Editor

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Add the following code snipped to your functions.php of your theme to enable this.
This is tested on WordPress 3.9 and may or may not work in other versions.

// Enable font size & font family selects in the editor
if ( ! function_exists( 'wpex_mce_buttons' ) ) {
	function wpex_mce_buttons( $buttons ) {
		array_unshift( $buttons, 'fontsizeselect' ); // Add Font Size Select
		return $buttons;
	}
}
add_filter( 'mce_buttons_2', 'wpex_mce_buttons' );