Modify Firefox titlebar through Javascript Extension

I have an extension for Firefox written in Javascript that 开发者_如何学GoI would like to make able to append text to the window's titlebar. Is this possible?

---

You can just use the document.title property to dynamically change your page's title, which is what it shows in the window's titlebar:

<script type="text/javascript">
document.title += "The Text You Want To Add";
</script>