i have my age verification pop up i want to appear only once when the site is visited and the pop up keeps appearing each item i refresh my browser, how do i go about it? answer will be much appreciated.

if (document.getElementById("newsletter-popup-form")) {
  setTimeout(function () {
    var mpInstance = $.magnificPopup.instance;
    if (mpInstance.isOpen) {
      mpInstance.close();
    }

    setTimeout(function () {
      $.magnificPopup.open({
        items: {
          src: "#newsletter-popup-form",
        },
        type: "inline",
        removalDelay: 350,
        callbacks: {
          open: function () {
            $("body").css("overflow-x", "visible");
            $(".sticky-header.fixed").css("padding-right", "1.7rem");
          },
          close: function () {
            $("body").css("overflow-x", "hidden");
            $(".sticky-header.fixed").css("padding-right", "0");
          },
        },
      });
    }, 500);
  }, 100);
}