Users can log into Firebird using a varierty of methods.  All these methods are available for each project by default but individual methods can be turned on and off.

EmailUsers can enter an email address and password. Passwords must follow the Password Policy.
SocialUsers can login using one of Google, LinkedIn or Facebook social logins to speed up their signing in process.
Single Sign OnUsers can login automatically and seamlessly from 3rd party systems. See Single Sign On.

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Password Policy

Single Sign On