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There's no need for this anymore security-wise thanks to First-Party Isolation AKA Total Cookie Protection. Every domain is totally separated.

• thrwawy74 4y ago
  I couldn't enumerate for you all the things isolated to a container; I am no expert. However, I believe first-party isolation only concerns itself with cookies.
  • Saris 4y ago
    IIRC cache is also isolated, I can't seem to find the blog post now, but as I remember mozilla essentially said that temporary containers are replaced by their site isolation.
    • thrwawy74 4y ago
      So FPI would cover the common need, to completely isolate 1 site from another. Containers would still be applicable if you wanted to maintain separate sessions to the same site. Like viewing a site without logging in, and in another tab doing so. I've found this good for webdev of course ~
      • Saris 4y ago
        Yep! I use containers for that, quite handy.