Just paste it into the browser console, and it will count contributions for you.
Array.from(document.querySelectorAll(".user-contrib-cell")).reduce((acc, el) => (isNaN(+acc) ? 0 : acc) + (el.getAttribute("title").trim().split(" ").length > 1 && isNaN(+el.getAttribute("title").trim().split(" ")[0]) ? 0 : +el.getAttribute("title").trim().split(" ")[0]));