popup.js

var websites = {
  badware: "http://www.google.com/safebrowsing/report_badware/?url=",
  webspam: "https://www.google.com/webmasters/tools/spamreportform?spamurl=",
  phishing: "http://www.google.com/safebrowsing/report_phish/?url=",
};

var options = document.querySelectorAll("div#options div.option");

for (var i = 0; i < options.length; i++) {
  options[i].innerText = chrome.i18n.getMessage("report_" + options[i].id);
  options[i].onclick = function (a) {
    var id = this.id;
    chrome.tabs.query(
      {
        lastFocusedWindow: true,
        active: true,
      },
      function (tab) {
        chrome.tabs.create({
          url: websites[id] + encodeURI(tab[0].url),
          index: tab[0].index + 1,
        });
      },
    );
  };
}