First I read the title and asked myself "what is that?" I googled it. The results left me thinking I had googled the trendy project management term of the year. I did manage to learn the basic concepts have been around since the 1940 and that Kanban (看板) is the Japanese word for “signboard,” Then I read about Kaban being a project management tool and I immediately thought of my dabbling with Microsoft Project and it's ilk in the 1990s. Then I read about Adobes workfront offering where I learned that kaban is a competing methodology with something called scrum. With scrum differing by having fixed timeframes for activities So now I have some idea what it is, I have to say I am not aware of any addons that might be related to the subject matter of Kaban. A search for the term on the addon site returned nothing https://kanbantool.com/kanban-board Perhaps you would like to offer a suggestion to the development team for a future feature. The link on the Thunderbird help menu for that is https://connect.mozilla.org/t5/ideas