Hi @punamdahiya,

I think it looks a little bit hacking.
We could do like this
```
var mozActivityData = {};

window.__defineGetter__('MozActivity', function() {
  return function fakeMozActivity(data) {
    mozActivityData = data;
  }
});

window.__defineGetter__('mozActivityData', function() {
  return mozActivityData;
});
```