That's part of the coming transaction explorer. The order of the values may still change but they will be clickable and open the explorer to show all details of that transaction/op.

The last number is the field 'op_in_trx' and it comes directly from the account history plugin of the connected node. I didn't check if the number shows the correct op index, but I know that it can differ from node to node. And of course there are also virtual operations to be handled a bit differently. If it should not be possible to retrieve the exact op index I will remove it and use my own op hash sum to jump to a specific op in the explorer.