Google account password

If you use FF to access you g account and it does not ask for pass, then it must be stored within FF

Same apply to any other browser

Or perhaps you use some third party pass manager...

You may be logged into YouTube with the same username/password, if you can find that one on the list.

You didnt respond to this

So, when you open FF and go to g, do you get sign in screen, where your username and password (dots) pre-populated?

I don't know how long, and I wouldn't recommend pushing it.

Unless one of your devices specifically store the password (e.g. in the Firefox settings you already checked), you can't retrieve your password. Even Google can't retrieve your password - they don't store it, they store what's called a "hash". That's a one-way function: if your password was originally "secret123", they will store it as "5d7845ac6ee7cfffafc5fe5f35cf666d". "secret123" can always be easily converted to that value, but it's not possible to convert that value back to "secret123". "secret123" won't ever be stored anywhere by Google

The hashed password? No, that's stored server-side. The token that I previously mentioned that keeps them logged in (which isn't the same thing) is stored client-side, and yes, that would be in cookies or localStorage, and could be lost if the browser data is cleared, depending on exact settings

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