gecko-dev/browser/base/content/test/browser_private_browsing_window.js

// Make sure that we can open private browsing windows

function test() {
  waitForExplicitFinish();
  var nonPrivateWin = OpenBrowserWindow();
  ok(!PrivateBrowsingUtils.isWindowPrivate(nonPrivateWin), "OpenBrowserWindow() should open a normal window");
  nonPrivateWin.close();

  var privateWin = OpenBrowserWindow({private: true});
  ok(PrivateBrowsingUtils.isWindowPrivate(privateWin), "OpenBrowserWindow({private: true}) should open a private window");

  nonPrivateWin = OpenBrowserWindow({private: false});
  ok(!PrivateBrowsingUtils.isWindowPrivate(nonPrivateWin), "OpenBrowserWindow({private: false}) should open a normal window");
  nonPrivateWin.close();

  whenDelayedStartupFinished(privateWin, function() {
    nonPrivateWin = privateWin.OpenBrowserWindow({private: false});
    ok(!PrivateBrowsingUtils.isWindowPrivate(nonPrivateWin), "privateWin.OpenBrowserWindow({private: false}) should open a normal window");

    nonPrivateWin.close();

    [
      { normal: "menu_newNavigator", private: "menu_newPrivateWindow", accesskey: true },
      { normal: "appmenu_newNavigator", private: "appmenu_newPrivateWindow", accesskey: false },
    ].forEach(function(menu) {
      let newWindow = privateWin.document.getElementById(menu.normal);
      let newPrivateWindow = privateWin.document.getElementById(menu.private);
      if (newWindow && newPrivateWindow) {
        ok(!newPrivateWindow.hidden, "New Private Window menu item should be hidden");
        isnot(newWindow.label, newPrivateWindow.label, "New Window's label shouldn't be overwritten");
        if (menu.accesskey) {
          isnot(newWindow.accessKey, newPrivateWindow.accessKey, "New Window's accessKey shouldn't be overwritten");
        }
        isnot(newWindow.command, newPrivateWindow.command, "New Window's command shouldn't be overwritten");
      }
    });

    privateWin.close();

    Services.prefs.setBoolPref("browser.privatebrowsing.autostart", true);
    privateWin = OpenBrowserWindow({private: true});
    whenDelayedStartupFinished(privateWin, function() {
      [
        { normal: "menu_newNavigator", private: "menu_newPrivateWindow", accessKey: true },
        { normal: "appmenu_newNavigator", private: "appmenu_newPrivateWindow", accessKey: false },
      ].forEach(function(menu) {
        let newWindow = privateWin.document.getElementById(menu.normal);
        let newPrivateWindow = privateWin.document.getElementById(menu.private);
        if (newWindow && newPrivateWindow) {
          ok(newPrivateWindow.hidden, "New Private Window menu item should be hidden");
          is(newWindow.label, newPrivateWindow.label, "New Window's label should be overwritten");
          if (menu.accesskey) {
            is(newWindow.accessKey, newPrivateWindow.accessKey, "New Window's accessKey should be overwritten");
          }
          is(newWindow.command, newPrivateWindow.command, "New Window's command should be overwritten");
        }
      });

      privateWin.close();
      Services.prefs.clearUserPref("browser.privatebrowsing.autostart");
      finish();
    });
  });
}