I really love this add-on! I recommend using "Containers Theme" add-on together with this add-on so you'll know exactly which container you're on without needing to look at the address bar ;).

I would like to suggest a few things:

1) There should be more colours in the selection. Better yet, we should have a colour panel to choose our own custom colour for container tabs.

2) Is there a way to add more icons into this add-on? It would be awesome to have a wide variety of icons to choose from in addition to the preinstalled ones.