function.js

function gsearch(term, callback) {
  dump("START", term, callback)
	var url = "http://ajax.googleapis.com/ajax/services/search/web?v=1.0&q=" + term;
	var req = new XMLHttpRequest;
  dump("END", term, callback)
	req.open('GET', url, true);
	req.onreadystatechange = function (aEvt) {
	  if (req.readyState == 4) {
		var reply = "Failed";
		 if(req.status == 200) {
			var json = JSON.parse(req.responseText);
			if(json.responseData.results.length > 0) {
				reply = json.responseData.results[0].url + " -> " + json.responseData.results[0].content;
			}
		 }
		callback(reply);
	  }
	};
	req.send(null);
}

output.txt

STARTWARNING: NS_ENSURE_TRUE(wrapper) failed: file /home/utkarsh/dev/hg/instantbird/mozilla/dom/base/nsJSUtils.cpp, line 153
nullnull[xpconnect wrapped (nsISupports, nsIClassInfo, imIConversation, purpleIConversation, nsIObserver, purpleIConvIM) @ 0xaef653e0 (native @ 0xaf1219e0)]