context:   _findChildShell: function (aDocShell, aSoughtShell)  {    if (aDocShell == aSoughtShell)      return aDocShell;          var node = aDocShell.QueryInterface(Components.interfaces.nsIDocShellTreeNode);    for (var i = 0; i < node.childCount; ++i) {      var docShell = node.getChildAt(i);      docShell = this._findChildShell(docShell, aSoughtShell);      if (docShell == aSoughtShell)        return docShell;    }    return null;  },
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