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Mozilla Firefox is Working on a Tab Grouping Feature
(news.itsfoss.com)
This is a most excellent place for technology news and articles.
Unfortunately, containers only isolate cookies and session data. It doesn't isolate history, bookmarks, saved logins, etc akin to Chrome's profiles. A major use of this is separating work and personal browsing.
Firefox technically has profiles as well (via about:profiles), but there's no profile switcher separate from an internal page.