Firefox Profiles function like a multi-user experience whereas Container Tabs function like a single-user experience that only looks like multiple users towards

Firefox Profiles function like a multi-user experience whereas Container Tabs function like a single-user experience that only looks like multiple users towards the internet. So, for example browsing history, bookmarks and add-ons are not separated by Container Tabs. Also, you can (obviously) use them in tabs, not just in separate windows like profiles.