diff -r 000000000000 -r 6474c204b198 toolkit/components/alerts/resources/content/alert.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/alerts/resources/content/alert.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,194 @@
+// -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+Components.utils.import("resource://gre/modules/Services.jsm");
+
+const Ci = Components.interfaces;
+const Cc = Components.classes;
+
+var windowMediator = Cc["@mozilla.org/appshell/window-mediator;1"]
+                       .getService(Ci.nsIWindowMediator);
+
+// Copied from nsILookAndFeel.h, see comments on eMetric_AlertNotificationOrigin
+const NS_ALERT_HORIZONTAL = 1;
+const NS_ALERT_LEFT = 2;
+const NS_ALERT_TOP = 4;
+
+const WINDOW_MARGIN = 10;
+
+var gOrigin = 0; // Default value: alert from bottom right.
+var gReplacedWindow = null;
+var gAlertListener = null;
+var gAlertTextClickable = false;
+var gAlertCookie = "";
+var gIsReplaced = false;
+
+function prefillAlertInfo() {
+  // unwrap all the args....
+  // arguments[0] --> the image src url
+  // arguments[1] --> the alert title
+  // arguments[2] --> the alert text
+  // arguments[3] --> is the text clickable?
+  // arguments[4] --> the alert cookie to be passed back to the listener
+  // arguments[5] --> the alert origin reported by the look and feel
+  // arguments[6] --> bidi
+  // arguments[7] --> lang
+  // arguments[8] --> replaced alert window (nsIDOMWindow)
+  // arguments[9] --> an optional callback listener (nsIObserver)
+
+  switch (window.arguments.length) {
+    default:
+    case 10:
+      gAlertListener = window.arguments[9];
+    case 9:
+      gReplacedWindow = window.arguments[8];
+    case 6:
+      gOrigin = window.arguments[5];
+    case 5:
+      gAlertCookie = window.arguments[4];
+    case 4:
+      gAlertTextClickable = window.arguments[3];
+      if (gAlertTextClickable) {
+        document.getElementById('alertNotification').setAttribute('clickable', true);
+        document.getElementById('alertTextLabel').setAttribute('clickable', true);
+      }
+    case 3:
+      document.getElementById('alertTextLabel').textContent = window.arguments[2];
+    case 2:
+      document.getElementById('alertTitleLabel').setAttribute('value', window.arguments[1]);
+    case 1:
+      if (window.arguments[0]) {
+        document.getElementById('alertImage').setAttribute('src', window.arguments[0]);
+      }
+    case 0:
+      break;
+  }
+}
+
+function onAlertLoad() {
+  const ALERT_DURATION_IMMEDIATE = 4000;
+  let alertTextBox = document.getElementById("alertTextBox");
+  let alertImageBox = document.getElementById("alertImageBox");
+  alertImageBox.style.minHeight = alertTextBox.scrollHeight + "px";
+
+  sizeToContent();
+
+  if (gReplacedWindow && !gReplacedWindow.closed) {
+    moveWindowToReplace(gReplacedWindow);
+    gReplacedWindow.gIsReplaced = true;
+    gReplacedWindow.close();
+  } else {
+    moveWindowToEnd();
+  }
+
+  window.addEventListener("XULAlertClose", function() { window.close(); });
+
+  if (Services.prefs.getBoolPref("alerts.disableSlidingEffect")) {
+    setTimeout(function() { window.close(); }, ALERT_DURATION_IMMEDIATE);
+    return;
+  }
+
+  let alertBox = document.getElementById("alertBox");
+  alertBox.addEventListener("animationend", function hideAlert(event) {
+    if (event.animationName == "alert-animation") {
+      alertBox.removeEventListener("animationend", hideAlert, false);
+      window.close();
+    }
+  }, false);
+  alertBox.setAttribute("animate", true);
+
+  if (gAlertListener) {
+    gAlertListener.observe(null, "alertshow", gAlertCookie);
+  }
+}
+
+function moveWindowToReplace(aReplacedAlert) {
+  let heightDelta = window.outerHeight - aReplacedAlert.outerHeight;
+
+  // Move windows that come after the replaced alert if the height is different.
+  if (heightDelta != 0) {
+    let windows = windowMediator.getEnumerator('alert:alert');
+    while (windows.hasMoreElements()) {
+      let alertWindow = windows.getNext();
+      // boolean to determine if the alert window is after the replaced alert.
+      let alertIsAfter = gOrigin & NS_ALERT_TOP ?
+                         alertWindow.screenY > aReplacedAlert.screenY :
+                         aReplacedAlert.screenY > alertWindow.screenY;
+      if (alertIsAfter) {
+        // The new Y position of the window.
+        let adjustedY = gOrigin & NS_ALERT_TOP ?
+                        alertWindow.screenY + heightDelta :
+                        alertWindow.screenY - heightDelta;
+        alertWindow.moveTo(alertWindow.screenX, adjustedY);
+      }
+    }
+  }
+
+  let adjustedY = gOrigin & NS_ALERT_TOP ? aReplacedAlert.screenY :
+                  aReplacedAlert.screenY - heightDelta;
+  window.moveTo(aReplacedAlert.screenX, adjustedY);
+}
+
+function moveWindowToEnd() {
+  // Determine position
+  let x = gOrigin & NS_ALERT_LEFT ? screen.availLeft :
+          screen.availLeft + screen.availWidth - window.outerWidth;
+  let y = gOrigin & NS_ALERT_TOP ? screen.availTop :
+          screen.availTop + screen.availHeight - window.outerHeight;
+
+  // Position the window at the end of all alerts.
+  let windows = windowMediator.getEnumerator('alert:alert');
+  while (windows.hasMoreElements()) {
+    let alertWindow = windows.getNext();
+    if (alertWindow != window) {
+      if (gOrigin & NS_ALERT_TOP) {
+        y = Math.max(y, alertWindow.screenY + alertWindow.outerHeight);
+      } else {
+        y = Math.min(y, alertWindow.screenY - window.outerHeight);
+      }
+    }
+  }
+
+  // Offset the alert by WINDOW_MARGIN pixels from the edge of the screen
+  y += gOrigin & NS_ALERT_TOP ? WINDOW_MARGIN : -WINDOW_MARGIN;
+  x += gOrigin & NS_ALERT_LEFT ? WINDOW_MARGIN : -WINDOW_MARGIN;
+
+  window.moveTo(x, y);
+}
+
+function onAlertBeforeUnload() {
+  if (!gIsReplaced) {
+    // Move other alert windows to fill the gap left by closing alert.
+    let heightDelta = window.outerHeight + WINDOW_MARGIN;
+    let windows = windowMediator.getEnumerator('alert:alert');
+    while (windows.hasMoreElements()) {
+      let alertWindow = windows.getNext();
+      if (alertWindow != window) {
+        if (gOrigin & NS_ALERT_TOP) {
+          if (alertWindow.screenY > window.screenY) {
+            alertWindow.moveTo(alertWindow.screenX, alertWindow.screenY - heightDelta);
+          }
+        } else {
+          if (window.screenY > alertWindow.screenY) {
+            alertWindow.moveTo(alertWindow.screenX, alertWindow.screenY + heightDelta);
+          }
+        }
+      }
+    }
+  }
+
+  if (gAlertListener) {
+    gAlertListener.observe(null, "alertfinished", gAlertCookie);
+  }
+}
+
+function onAlertClick() {
+  if (gAlertListener && gAlertTextClickable) {
+    gAlertListener.observe(null, "alertclickcallback", gAlertCookie);
+  }
+
+  window.close();
+}