code: def device_mounted(self, device):
          
          if not self._mounter.is_handleable(device):
              return
          browse_action = ('browse', _('Browse directory'),
                           self._mounter.browse, device)
          terminal_action = ('terminal', _('Open terminal'),
                             self._mounter.terminal, device)
          self._show_notification(
              'device_mounted',
              _('Device mounted'),
              _('{0.ui_label} mounted on {0.mount_paths[0]}', device),
              device.icon_name,
              self._mounter._browser and browse_action,
              self._mounter._terminal and terminal_action)
docs: Show mount notification for specified device object.