416163 - FF 3.x XUL: iframe onload event fires multiple times, when document's favicon is changed dynamically

Status: UNCONFIRMED

(Core :: XUL, defect)

Description

[telega]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9b3) Gecko/2008020514 Firefox/3.0b3
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9b3) Gecko/2008020514 Firefox/3.0b3

Onload event for <iframe> element in XUL document fires multiple times, when favicon element is dynamically changed (removed and added back). This happens in FF 3.x only, FF 2.x works fine.

Reproducible: Always

Steps to Reproduce:
1.Open test.xul (listed below in Additional Information) document in FF 3.x and click "test" button.
Actual Results:  
Iframe onload event fires each time favicon element is appended to the document.

Expected Results:  
Iframe onload event should not fire.

test.xul:
---------
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
<window id="test"
        xmlns:html="http://www.w3.org/1999/xhtml"
        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">

  <html:link id="favicon" rel="shortcut icon"/>
  <iframe onload="alert('iframe onload');" style="background: white;"/>
  <button label="test" oncommand="updateFavIcon();"/>

  <script>
    <![CDATA[
      function updateFavIcon() {
        var favicon = document.getElementById("favicon");
        favicon.parentNode.removeChild(favicon);
        document.documentElement.appendChild(favicon);
      }
    ]]>
  </script>
</window>