diff -r 000000000000 -r 6474c204b198 toolkit/modules/SelectParentHelper.jsm
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/modules/SelectParentHelper.jsm	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,94 @@
+/* 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/. */
+
+"use strict";
+
+this.EXPORTED_SYMBOLS = [
+  "SelectParentHelper"
+];
+
+let currentBrowser = null;
+
+this.SelectParentHelper = {
+  populate: function(popup, items, selectedIndex) {
+    // Clear the current contents of the popup
+    popup.textContent = "";
+    populateChildren(popup, items, selectedIndex);
+  },
+
+  open: function(browser, popup, rect) {
+    currentBrowser = browser;
+    this._registerListeners(popup);
+    popup.hidden = false;
+
+    let {x, y} = browser.mapScreenCoordinatesFromContent(rect.left, rect.top + rect.height);
+    popup.openPopupAtScreen(x, y);
+  },
+
+  hide: function(popup) {
+    popup.hidePopup();
+  },
+
+  handleEvent: function(event) {
+    let popup = event.currentTarget;
+
+    switch (event.type) {
+      case "command":
+        if (event.target.hasAttribute("value")) {
+          currentBrowser.messageManager.sendAsyncMessage("Forms:SelectDropDownItem", {
+            value: event.target.value
+          });
+        }
+        popup.hidePopup();
+        break;
+
+      case "popuphidden":
+        currentBrowser.messageManager.sendAsyncMessage("Forms:DismissedDropDown", {});
+        currentBrowser = null;
+        this._unregisterListeners(popup);
+        break;
+    }
+  },
+
+  _registerListeners: function(popup) {
+    popup.addEventListener("command", this);
+    popup.addEventListener("popuphidden", this);
+  },
+
+  _unregisterListeners: function(popup) {
+    popup.removeEventListener("command", this);
+    popup.removeEventListener("popuphidden", this);
+  },
+
+};
+
+function populateChildren(element, options, selectedIndex, startIndex = 0, isGroup = false) {
+  let index = startIndex;
+
+  for (let option of options) {
+    let item = element.ownerDocument.createElement("menuitem");
+    item.setAttribute("label", option.textContent);
+    item.setAttribute("type", "radio");
+
+    if (index == selectedIndex) {
+      item.setAttribute("checked", "true");
+    }
+
+    element.appendChild(item);
+
+    if (option.children.length > 0) {
+      item.classList.add("contentSelectDropdown-optgroup");
+      item.setAttribute("disabled", "true");
+      index = populateChildren(element, option.children, selectedIndex, index, true);
+    } else {
+      item.setAttribute("value", index++);
+
+      if (isGroup) {
+        item.classList.add("contentSelectDropdown-ingroup")
+      }
+    }
+  }
+
+  return index;
+}