Great add-on Rated 5 out of 5 stars
Adds a few useful extras to the Trello UI. As indicated in red in the author's diagram, the add-on shows the number of cards in each list and the board, the card's unique number, and extends the coloured label across the width of the card (complete with text) rather than the rather small square that Trello displays. This last one really makes it easy to see what label is applied to a card. My labels indicate the priority of the card, so making them easy to see ensures that nothing slips past me. Big labels are especially useful if you have poor eyesight.
The author is active in developing and supporting the add-on and welcomes suggestions for new features.