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1 month agoProbably referring to this. It was introduced in 138.
https://support.mozilla.org/en-US/kb/profile-management
A different profile may make sense if you like multiple sets of browser settings, bookmarks, and extensions separate from one another.
A container may be better if you prefer the same settings, bookmarks, extensions, but a different set of cache and cookies on a specific site.
Carthwright.