Shows only feeds with unread items in netvibes' sidebar

netvibes_unread_sidebar.js

window.setInterval( function() {
    Array.prototype.slice.call(document.getElementsByClassName('nv-treeview-feed'), 0).map(
    function (el, idx, arr) {
        // if you're running on chromium you may need to use innerText
        if (el.children[0].children[2].innerHTML == 0) {
            el.hidden = true;
        } else {
            el.hidden = false;
        }
    }
)}, 2000)