public static function add_popup_filters() {
		global $typenow;

		// Checks if the current post type is 'popup'
		if ( $typenow == 'popup' ) {

			if ( get_taxonomy( 'popup_category' ) ) {
				$terms = get_terms( 'popup_category' );
				if ( count( $terms ) > 0 ) {
					echo "<select name='popup_category' id='popup_category' class='postform'>";
					echo "<option value=''>" . __( 'Show all categories', 'popup-maker' ) . "</option>";
					foreach ( $terms as $term ) {
						$selected = isset( $_GET['popup_category'] ) && $_GET['popup_category'] == $term->slug ? 'selected="selected"' : '';
						echo '<option value="' . esc_attr( $term->slug ) . '" ' . $selected . '>' . esc_html( $term->name ) . ' (' . $term->count . ')</option>';
					}
					echo "</select>";
				}
			}

			if ( get_taxonomy( 'popup_tag' ) ) {
				$terms = get_terms( 'popup_tag' );
				if ( count( $terms ) > 0 ) {
					echo "<select name='popup_tag' id='popup_tag' class='postform'>";
					echo "<option value=''>" . __( 'Show all tags', 'popup-maker' ) . "</option>";
					foreach ( $terms as $term ) {
						$selected = isset( $_GET['popup_tag'] ) && $_GET['popup_tag'] == $term->slug ? 'selected="selected"' : '';
						echo '<option value="' . esc_attr( $term->slug ) . '" ' . $selected . '>' . esc_html( $term->name ) . ' (' . $term->count . ')</option>';
					}
					echo "</select>";
				}
			}
		}

	}