diff -r 000000000000 -r 6474c204b198 toolkit/components/prompts/content/selectDialog.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/prompts/content/selectDialog.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,68 @@
+/* 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/. */
+
+const Ci = Components.interfaces;
+const Cr = Components.results;
+const Cc = Components.classes;
+const Cu = Components.utils;
+
+let gArgs, listBox;
+
+function dialogOnLoad() {
+    gArgs = window.arguments[0].QueryInterface(Ci.nsIWritablePropertyBag2)
+                               .QueryInterface(Ci.nsIWritablePropertyBag);
+
+    let promptType = gArgs.getProperty("promptType");
+    if (promptType != "select") {
+        Cu.reportError("selectDialog opened for unknown type: " + promptType);
+        window.close();
+    }
+
+    // Default to canceled.
+    gArgs.setProperty("ok", false);
+
+    document.title = gArgs.getProperty("title");
+
+    let text = gArgs.getProperty("text");
+    document.getElementById("info.txt").setAttribute("value", text);
+
+    let items = gArgs.getProperty("list");
+    listBox = document.getElementById("list");
+
+    for (let i = 0; i < items.length; i++) {
+        let str = items[i];
+        if (str == "")
+            str = "<>";
+        listBox.appendItem(str);
+        listBox.getItemAtIndex(i).addEventListener("dblclick", dialogDoubleClick, false);
+    }
+    listBox.selectedIndex = 0;
+    listBox.focus();
+
+    // resize the window to the content
+    window.sizeToContent();
+
+    // Move to the right location
+    moveToAlertPosition();
+    centerWindowOnScreen();
+
+    // play sound
+    try {
+        Cc["@mozilla.org/sound;1"].
+        createInstance(Ci.nsISound).
+        playEventSound(Ci.nsISound.EVENT_SELECT_DIALOG_OPEN);
+    } catch (e) { }
+}
+
+function dialogOK() {
+    let selected = listBox.selectedIndex;
+    gArgs.setProperty("selected", listBox.selectedIndex);
+    gArgs.setProperty("ok", true);
+    return true;
+}
+
+function dialogDoubleClick() {
+    dialogOK();
+    window.close();
+}