Unable to call firebreath dll functions

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Firefox

My firefox plugin is written using firebreath framework. It works absolutely fine upto version 28 of firefox. For higher versions I was unable to call the functions of firebreath dll from my javascript page. I have also attached my source code for your reference. Does anyone know the solution to my problem??

var plugin = document.getElementById('dllID');
if(plugin.valid)
{
    var ngInfo = plugin.ReturnUsers(param1, param2);
    if(ngInfo.length >0)
    {
        // do something
    }
}