browser_bug495058.js

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function test() {
  waitForExplicitFinish();
  next();
}

var uris = [
  "about:blank",
  "about:sessionrestore",
  "about:privatebrowsing",
];

function next() {
  var tab = gBrowser.addTab();
  var uri = uris.shift();

  if (uri == "about:blank") {
    detach();
  } else {
    let browser = tab.linkedBrowser;
    browser.addEventListener("load", function () {
      browser.removeEventListener("load", arguments.callee, true);
      detach();
    }, true);
    browser.loadURI(uri);
  }

  function detach() {
    var win = gBrowser.replaceTabWithWindow(tab);
    win.addEventListener("load", function () {
      win.removeEventListener("load", arguments.callee, false);

      var _delayedStartup = win.delayedStartup;
      win.delayedStartup = function delayedStartup() {
        _delayedStartup.apply(win, arguments);
        win.delayedStartup = _delayedStartup;

        is(win.gBrowser.currentURI.spec, uri, uri + ": uri loaded in detached tab");
        is(win.document.activeElement, win.gBrowser.selectedBrowser, uri + ": browser is focused");
        is(win.gURLBar.value, "", uri + ": urlbar is empty");
        ok(win.gURLBar.emptyText, uri + ": emptytext is present");
        ok(win.gURLBar.hasAttribute("isempty"), uri + ": emptytext is displayed");

        win.close();
        if (uris.length)
          next();
        else
          executeSoon(finish);
      };
    }, false);
  }
}