For example, change your password regularly, use 2FA.
Firefox profile management is clunky. Chrome multiple profiles are fast to switch between and the user interface is clear. You know which profile a window belongs too, you can see the name and the icon. Since I only use it to be logged in anyway, it’s not a huge security concern. Consider if you have like 20 profiles and you want to switch between them.
Firefox account containers are very clean and easy for this. The tabs get colour coded based on which account is logged in and you can configure certain sites to always open in certain containers.
I want to trust Firefox containers, but it’s always been ambiguous to me. I like the very clean separation of profiles. The ability to change theme/colors of profiles.
If I have multiple Gmail accounts for instance, I don’t think Firefox containers help me.