Question 1

How do I change the colors and styling in FirebaseUI?

Accepted Answer

FirebaseUI uses CSS variables for theming: override variables like --fui-primary and --fui-background in your CSS, or use the Tailwind-specific import for utility-based styling, as explained in the Styling section.

Question 2

FirebaseUI vs Supabase Auth UI: which should I use?

Accepted Answer

FirebaseUI is optimized for Firebase authentication with deep integration and pre-built components. Supabase Auth UI is tailored for Supabase and might offer different features. Choose based on your backend: FirebaseUI for Firebase, Supabase Auth UI for Supabase.

Question 3

Does FirebaseUI work with Vue.js or Svelte?

Accepted Answer

No, FirebaseUI only officially supports React, Angular, and Shadcn. For Vue.js or Svelte, you'd need to use the framework-agnostic core package to build custom UI, which requires more effort.

Question 4

How to implement phone authentication with FirebaseUI?

Accepted Answer

Use the PhoneAuthForm or PhoneAuthScreen components, configure the recaptchaVerification behavior for reCAPTCHA settings, and handle verification flows via the provided hooks or methods in the reference API.

Question 5

Is FirebaseUI v7 ready for production use?

Accepted Answer

Version 7 is in beta, so it may have unresolved bugs or breaking changes. Check the migration guide and release notes carefully before deploying to production, and consider testing thoroughly in staging.

Question 6

How to add a custom OAuth provider not listed in FirebaseUI?

Accepted Answer

FirebaseUI only supports standard Firebase OAuth providers (e.g., Google, GitHub). For custom providers, you might need to extend the core logic or build a custom UI using the framework-agnostic package and Firebase SDK directly.

Question 7

What's the performance impact of using FirebaseUI?

Accepted Answer

FirebaseUI adds bundle size from its components and dependencies, but it's optimized for modern frameworks. For lightweight projects, consider if the convenience outweighs the overhead, especially with multiple behaviors enabled.

Firebase UI

What is Firebase UI?

Overview

Use Cases

Best For

Related Projects

Found a gem we're missing?

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions