Is there any way of getting Netbeans code completion to work with XPCOM components?

Question

I'm writing a Firefox Addon in Netbeans 6.8. The Ctrl+space code completion for my own code or native javascript elements is very useful, but is there any way of making it aware of XPCOM (eg so that code completion would suggest the methods of nsIHttpChannel in the following code)?

 /**
  * @param {nsIHttpChannel} cSubject
  */
 captureResult: function(cSubject)
 {
 }