Enable container specific saved passwords

I’ve been using firefox containers for a while and they are really useful. However, one use case that they currently don’t work well with is saving passwords for websites in only the current container.

https://wiki.mozilla.org/Security/Contextual_Identity_Project/Containers specifies that this is intentional. Could someone clarify why this is, or ideally provide a mechanism to support this? Would exposing this functionality to 3p developers who can build addons be an option?

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I was also wondered if there is an add-on for this. And got this post later. Then, I had created an add-on for this use case.

You may have a try: https://addons.mozilla.org/en-US/firefox/addon/account-per-container/

This add-on only remember and fill username, but not passwords. It helps you auto-fill usernames based on containers and sites. Passwords are filled by built-in password manager or your password manager extension.