For Firebase Authentication there is no documented limit on the number of users that you can register within a project, but there are time based quotas to prevent abuse.
I recommend checking out the Firebase pricing page, and the quota and limits in the documentation for each product.
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对于Firebase身份验证，您可以在项目中注册的用户数量没有记录的限制，但是有基于时间的配额防止滥用。
我建议查看 firebase定价页面，以及每种产品的文档中的配额和限制。
For Firebase Authentication there is no documented limit on the number of users that you can register within a project, but there are time based quotas to prevent abuse.
I recommend checking out the Firebase pricing page, and the quota and limits in the documentation for each product.