The Tor Browser / file revision

 /* Any copyright is dedicated to the Public Domain.

    http://creativecommons.org/publicdomain/zero/1.0/ */

 function test() {

   let originalTab = gBrowser.selectedTab;

   isnot(originalTab.lastAccessed, 0, "selectedTab has been selected");

   ok(originalTab.lastAccessed <= Date.now(), "selectedTab has a valid timestamp");

   let newTab = gBrowser.addTab("about:blank", {skipAnimation: true});

   is(newTab.lastAccessed, 0, "newTab hasn't been selected so far");

   gBrowser.selectedTab = newTab;

   isnot(newTab.lastAccessed, 0, "newTab has been selected");

   ok(newTab.lastAccessed <= Date.now(), "newTab has a valid timestamp");

   isnot(originalTab.lastAccessed, 0, "originalTab has been selected");

   ok(originalTab.lastAccessed <= Date.now(), "originalTab has a valid timestamp");

   ok(originalTab.lastAccessed <= newTab.lastAccessed,

      "originalTab's timestamp must be lower than newTab's");

   gBrowser.removeTab(newTab);

 }