Unable to use Java in Firefox 16 Extension using Live Connect

In Firefox 16, java can no longer be accessed using the global instance as per https://bugzilla.mozilla.org/show_bug.cgi?id=748343.
I have built a custom selenium-ide.xpi (http://seleniumhq.org/download/) which loads up java and runs through my custom framework. To access java I added an addJava.js file, which I included in the selenium-ide-common.xul file calling the java using something like what is found at https://developer.mozilla.org/en-US/docs/Java_in_Firefox_Extensions, however this no longer works.
Does anyone know how to fix this?
Thanks in advance, James

For some reason the below didn't post in the initial post.
I've tried the following to fix the issue:
Adding the below to the various .xul files, but each time I try the below I get that appletRef is null:
<div name="appletDiv">
<embed id ="cipherDocsApplet" type="application/x-java-applet;version=1.6" code="java.applet.Applet" pluginspage="http://java.com/download/" MAYSCRIPT="true" width="0" height="0" />
</div>
var appletRef = document.getElementById("cipherDocsApplet");
window.java = appletRef.Packages.java;
The below gives me java_instance.Packages is undefined.
var java_instance = window.document.createElementNS("http://www.w3.org/1999/xhtml","applet");
java_instance.setAttribute("id", "adsfund_java_instance");
java_instance.setAttribute("code", "java.applet.Applet");
java_instance.setAttribute("width", "0");
java_instance.setAttribute("height", "0");
java_instance.setAttribute("flex", "1");
var div = window.document.createElementNS("http://www.w3.org/1999/xhtml","div");
var elementToAppendTo = window.document.getElementsByTagName("vbox")[0];
elementToAppendTo.appendChild(div);
div.appendChild(java_instance);
var date = new java_instance.Packages.java.util.Date();
Finally I tried https://bug748343.bugzilla.mozilla.org/attachment.cgi?id=655062, adding the app element to my main xul file and getting it later, but that also gives me the same error: 'TypetError:app.Packages is undefined.'

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