Lichess.org chat/whisper with move numbers is a free Chrome add-on developed by timothyha. It falls under the category of Browsers and is specifically classified as an Add-ons & Tools subcategory. This program allows users to send chat messages or whispers to the spectators' room while automatically adding move numbers.

With Lichess.org chat/whisper with move numbers, users can easily communicate with their opponents on Lichess.org by sending chat messages or whispers. The add-on automatically adds move numbers to the messages, making it easier for spectators to follow the thought process of the players.

This Chrome add-on is a useful tool for chess players who want to enhance their communication during games on Lichess.org. By providing move numbers in chat messages and whispers, it improves the overall experience for both players and spectators.