The Tor Browser / file revision

 function test() {

   waitForExplicitFinish();

   let tab = gBrowser.addTab("http://example.com");

   gBrowser.selectedTab = tab;

   onLoad(function () {

     let originalValue = gURLBar.value;

     gBrowser.userTypedValue = "foobar";

     gBrowser.selectedTab = gBrowser.tabs[0];

     gBrowser.selectedTab = tab;

     is(gURLBar.value, "foobar", "location bar displays typed value");

     gURLBar.focus();

     EventUtils.synthesizeKey("VK_ESCAPE", {});

     is(gURLBar.value, originalValue, "ESC reverted the location bar value");

     gBrowser.removeTab(tab);

     finish();

   });

 }

 function onLoad(callback) {

   gBrowser.selectedBrowser.addEventListener("pageshow", function loadListener() {

     gBrowser.selectedBrowser.removeEventListener("pageshow", loadListener, false);

     executeSoon(callback);

   });

 }