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How does Firebase generate Uid?

My question is: how does Firebase generate Uid? Is it created from installing the application on a mobile phone, or maybe it is based on the login provider via email, Facebook, Google or others that Firebase provides?

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The Firebase user ID (often called uid) is an opaque identifier for the user account. It has nothing to do with the underlying identity provider (s) for the account and should be considered an opaque value.

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Source: https://habr.com/ru/post/1650127/

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