Love the idea and the simplicity of extension! On the other hand the extension lacks 2 must-have features:
1. Sync containers: name, icons and - the most important - assigned sites for each container. Actually this functionality can be implemented by syncing 2 files in profile folder only: containers.json and storage.js (in extensions folder)
2. the option to open a link from containerized website in (a) a no-container tab or (b) in default-container tab
Otherwise is great.
Cheers!