How to fix or replace mouseenter and mouseleave js in mozilla?

Question

JavaScript

On the page your-webmasters.com/demo/velo/index.php you can see a dropdown basket when hovering over the button.
For this, I used the construction

// Cart drop down
  $(".m-cart__drop").mouseenter(function () {
    $(".m-cart__dropdown").slideDown();
  });
  $(".m-cart").mouseleave(function () {
    $(".m-cart__dropdown").slideUp();
  });
  $(".m-cart__drop").on("click", function () {
    return false;
  });

Everything works as it should, but in Mozilla Firefox, when you hover over the delete cross, mouseleave is triggered.
How can this be fixed and why is this happening?