code: def launch(self):
          
          try:
              # init virtual Display
              self.vbro = Display()
              self.vbro.start()
              logger.debug("virtual display launched")
          except Exception:
              raise exceptions.VBroException()
          try:
              self.browser = Browser(self.brow_name)
              logger.debug(f"browser {self.brow_name} launched")
          except Exception:
              raise exceptions.BrowserException(
                  self.brow_name, "failed to launch")
          return True
docs: launch browser and virtual display, first of all to be launched