What are you talking about? Firefox doesn’t need an email address for container tabs or separate profiles, and I think you can still host your own sync server if you want that capability.
I haven’t checked if Container tabs work on Torn Browser, but that’s my go-to for anonymity.
Yup, on Firefox, profiles are just directories of settings, and you can have as many as you choose. AFAIK, few people use them, since you can get most of that behavior with container tabs. For example, at work, I have one container group for work Gmail, one for personal, and if my wife uses it, she can open another group for her stuff.
I’d use profiles for a shared login on a computer, but I’d just use separate user accounts instead. I use container tabs for multiple logins for the same service on one profile. Switching then just means opening a new tab with that container group.
