Firebase, a serverless platform by Google, offers customer identity and access management along with other functionalities necessary for application development. Despite its benefits, such as cost-effectiveness and ease of use, some users consider migrating due to limitations in standards, data control, and certain features like geographic deployment and OAuth grants. Migration considerations involve evaluating whether Firebase's unique features outweigh its downsides, such as the need for more control over data location or specific testing setups. For those opting to migrate, the article outlines two primary strategies: bulk migration, which involves transferring all user data at once, and drip migration, which gradually transitions users upon login. Each method has its advantages and challenges, including potential disruptions to user experience and system dependencies. The guide emphasizes the importance of setting up a new authentication system that supports necessary functionalities and provides guidance on user data migration, focusing on whether a bulk or gradual approach is more suitable.