diff -r 000000000000 -r 6474c204b198 browser/base/content/test/general/browser_urlbarRevert.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/base/content/test/general/browser_urlbarRevert.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,29 @@
+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);
+  });
+}