localStorage keys / Cookies used:
  _fbly_init_WIDGET ID Unix timestamp of Feedbackly widget inited
 _fbly_completed_WIDGET_ID Unix timestamp of Feedbackly widget survey completed
 _fbly_curpgId_WIDGET_ID Unix timestamp of landing on the current page
 _fbly_visited_WIDGET_ID an array of visited urls on site
 _fbly_closed WIDGET_ID Unix timestamp of a widget closed (edited) 

These stored values have no expiration date, due to technical reasons of providing the service.