Firefox

I like to have the containers in a particular order, so I can find the correct one quickly, but there's no way to reorder them unless you delete and remake them.

I've also had to delete containers a few times, which means that I lose the "always open this site in X container" data. This might end up leaking info to one of those sites.

It seems like it should be easy to implement. While we're at it, container profiles might be nice, where you can show and hide container groups. However, the first two points are more important