Is Zen tab: Beautiful, simple new tab safe?

mostVisited.start = function () {  var widget = this.create();  chrome.topSites.get(function (data) {    html = "<ul>";    if (data.length > 9 && data.length < 12) {      data = data.slice(0, 9);    }    function faviconURL(u) {      const url = new URL(chrome.runtime.getURL("/_favicon/"));      url.searchParams.set("pageUrl", u);      url.searchParams.set("size", "32");      return url.toString();    }    $.each(data, function (index, value) {      if (index < 12) {        // Reduce the visited URL to protocol + hostname + path        var a = $("<a>", { href: value.url })[0];        var simpleURL = a.protocol + "//" + a.hostname + a.pathname;        // Ask zen-tab.com for a thumbnail, embedding the visited-site URL        var thumbPicture =          "https://zen-tab.com/?version=" + $.zentab.fullversion +          "&pag=thumb&url=" + simpleURL;        $.zentab.widgets.mostVisited.load("thumb." + simpleURL, function (pic) {          if ($.isset(pic) && pic.life > new Date().getTime()) {            thumbPicture = pic.thumb; // cached, no request this time          } else {            // Cache miss: fetch the thumbnail image from zen-tab.com now            $.toDataURL(thumbPicture, function (dataUrl) {              if ($.isset(dataUrl)) {                $.zentab.widgets.mostVisited.save("thumb." + simpleURL, {                  thumb: dataUrl,                  life: new Date().getTime() + $.zentab.widgets.mostVisited.thumbLife,                });              }            });          }          html += "<li class='mv" + index + "'>...</li>"; // renders the tile        });      }    });    html += "</ul>";    $(widget).append(html);  });};