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>