"Select element to hide" not visible in PanelUI

lib/windowWrapper.js

 /*
  * This Source Code is subject to the terms of the Mozilla Public License
  * version 2.0 (the "License"). You can obtain a copy of the License at
  * http://mozilla.org/MPL/2.0/.
  */
 
 let {Aardvark} = require("aardvark");
 let {Prefs} = require("prefs");
 let {KeySelector} = require("keySelector");
 
@@ skipping 58 matching lines @@
 
   E: function(id)
   {
     let doc = this.window.document;
     this.E = function(id) doc.getElementById(id);
     return this.E(id);
   },
 
   popupShowingHandler: function(event)
   {
-    let popup = event.target;
+    let popup = event.originalTarget;
     if (!/^(abp-(?:toolbar|status|menuitem)-)popup$/.test(popup.id))
       return;
 
     this.popupHiddenHandler(event);
 
     let enabled = Aardvark.canSelect(this.browser);
     let running = (enabled && this.browser == Aardvark.browser);
 
     let [labelStart, labelStop] = getMenuItem();
     let item = popup.ownerDocument.createElement("menuitem");
@@ skipping 10 matching lines @@
 
     let insertBefore = null;
     for (let child = popup.firstChild; child; child = child.nextSibling)
       if (/-options$/.test(child.id))
         insertBefore = child;
     popup.insertBefore(item, insertBefore);
   },
 
   popupHiddenHandler: function(event)
   {
-    let popup = event.target;
+    let popup = event.originalTarget;
     if (!/^(abp-(?:toolbar|status|menuitem)-)popup$/.test(popup.id))
       return;
 
     let items = popup.getElementsByClassName("elemhidehelper-item");
     while (items.length)
       items[0].parentNode.removeChild(items[0]);
   },
 
   keyPressHandler: function(event)
   {
@@ skipping 19 matching lines @@
   },
 
   toggleSelection: function()
   {
     if ("@adblockplus.org/abp/public;1" in Cc && this.browser != Aardvark.browser)
       Aardvark.start(this);
     else
       Aardvark.quit();
   }
 };