Adds card numbers (ID's) to Trello cards. Trello cards have unique ID's associated with them, but they are not displayed. This extension displays the unique ID's of each card in order to visually identify it. This is useful, for example, when a team is discussing a Trello board and prefers to use ID's in place of content for the sake of clarity. Source code available on GitHub: https://github.com/hal313/trello-card-numbers-chrome-extension