Similar to Firefox Container tabs it would be useful to have containers (like "Work", "Private", etc.) in Firefox password manager to differentiate between accounts for the same service, but different contexts.
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I like idea, but I would advocate for tags/labels rather than categories (so to have a password tag with one or more tags instead of putting a credential in only one fixed category).
i wouldnt suggest saving passwords in Mozilla or any other browser its how most hacks access you data info to start with and mozilla is not that strong on it encryption and safety