Do you mean that it would be exposed by the referrer? I guess so. It’s not clear whether the referrer is preserved anyway when you refresh the external page in a different container. In theory could the external page have a Facebook widget that would be able to see your Facebook account anyway? I’m not really sure, I don’t know enough about how cookies work across domains.
I feel like this is the point. It’s not really clear how to best use containers to protect your privacy; it feels like you have to understand a lot about how the web works and how Firefox works.
> It’s not really clear how to best use containers to protect your privacy
Do you think private browsing sessions are also unclear/have unintuitive UX? It seems like firefox containers are just private browsing sessions that you can close and re-open.
Private browsing is relatively simple - nothing is preserved. It’s similar but definitely easier to understand than containers, where you have _n_ containers, each with some subset of cookies representing your identities on various sites. Not only do you have to mentally keep track of what cookies are in each container and make sure to always open certain links in the right container, you also have to worry about unique URL signatures permanently leaking your identity between containers if you’re not careful, as mentioned in a sibling comment.
I feel like this is the point. It’s not really clear how to best use containers to protect your privacy; it feels like you have to understand a lot about how the web works and how Firefox works.