@dalias @ricci OR maybe I am confusing 2 things as the FAQ at https://support.mozilla.org/en-US/kb/containers says "Are Firefox containers and Multi-account containers the same? Firefox Containers and Multi-Account Containers are complementary features that help you keep your online activities organized. While both options allow you to separate your browsing into different container tabs, the Firefox Containers feature allows you to always open new tabs in containers."
@pmevzek @ricci Multi-Account Containers sounds sketchy (integration with their VPN partner stuff) and like it does unwanted things (automatically switching to a container context based on which site you're loading, vs locking to a context and always opening links in that container context) that harm privacy instead of preserving it.