nightly error

gistfile1.txt

hasgeek@hasgeek-MacBook:~/codes/js/B2G$ error: ddg_for_firefox: An exception occurred.
Traceback (most recent call last):
  File "resource://jid1-zadieub7xozojw-at-jetpack/api-utils/lib/xhr.js", line 125, in 
    self._orsc.apply(self, arguments);
  File "resource://jid1-zadieub7xozojw-at-jetpack/addon-kit/lib/request.js", line 91, in onreadystatechange
    emit(target, 'complete', response);
  File "resource://jid1-zadieub7xozojw-at-jetpack/api-utils/lib/event/core.js", line 83, in emit
    for each (let item in emit.lazy.apply(emit.lazy, arguments)) {
  File "resource://jid1-zadieub7xozojw-at-jetpack/api-utils/lib/event/core.js", line 101, in lazy
    yield listeners.shift().apply(target, args);
  File "resource://jid1-zadieub7xozojw-at-jetpack/ddg_for_firefox/lib/main.js", line 159, in pageModGoogle<.onAttach/</<.onComplete
    worker.port.emit('results-loaded', {'response': response.json});
  File "resource://jid1-zadieub7xozojw-at-jetpack/api-utils/lib/content/worker.js", line 364, in 
    emit: function () self._emitEventToContent(Array.slice(arguments))
  File "resource://jid1-zadieub7xozojw-at-jetpack/api-utils/lib/content/worker.js", line 399, in _emitEventToContent
    throw new Error(ERR_FROZEN);
Error: The page is currently hidden and can no longer be used until it is visible again.