this post was submitted on 17 Jan 2026
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These new profiles that can be accessed through menu are not exactly sub-profiles, but I think more like sibling-profiles forming a profile group. Profiles in the same group know about each other, so in the UI you can switch between them and I think there are some settings that can be shared between the profiles in the same group.
I don't know of any plans to deprecate the old profile system, nor about:profiles for managing them.
Thx