The idea is great; we need such a thing. The execution, however, is not great. Sure, it is a good thing to have in this state, if you are heavily relying on containers and never open a single tab outside containers. But it disables the whole Theme aspect of Firefox altogether. I expected it to let me select separate themes for each container, as well as respect my theme choice for the uncontained sessions.

This is a great idea. Thank you for creating it.

Unfortunately, it does not work at all for me.

Also, why is it 2MB in size? That's very large for a simple extension.

I think this extension has a lot of promise.