null true if (!this._draggableStarted) { this._draggableStarted = true; try { Components.utils.import("resource://gre/modules/WindowDraggingUtils.jsm"); new WindowDraggingElement(this, window); } catch (e) {} } true if (!this._draggableStarted) { this._draggableStarted = true; try { Components.utils.import("resource://gre/modules/WindowDraggingUtils.jsm"); new WindowDraggingElement(this, window); } catch (e) {} }