This actually looks like a cool project. Is it easy to move profiles from one computer to another with it?

They are stored in ~/Library/Application Support/DonutBrowser/profiles. So right now you can use something like Syncthing to synchronize the data across desktops. Once the project matures enough, I may add add end-to-end encrypted sync. If you just want to manually do it, it's as easy as copying the profile folder and the .json file with the same name.