As of my knowledge cutoff date in September 2021, there have been some reported issues with Firebase Authentication and SAML providers in certain versions of Firefox. These issues may be related to browser-specific behaviors or compatibility with the SAML authentication flow used by Firebase Identity Platform.

Here are some steps you can take to troubleshoot and potentially resolve the issue:

  1. Check Browser Compatibility: Ensure that you are using a version of Firefox that is officially supported by Firebase Authentication and Firebase Identity Platform. Check the Firebase documentation for the latest information on supported browsers.

  2. Clear Browser Cache and Cookies: Sometimes, caching issues can interfere with the authentication flow. Clear your browser cache and cookies to ensure you are starting with a clean session.

  3. Update Firefox: Make sure you are using the latest version of Firefox. Outdated versions may have compatibility issues or bugs that have been addressed in newer releases.

  4. Check Browser Extensions: Some browser extensions or add-ons might interfere with the authentication process. Try disabling all extensions and test the SAML authentication flow again to see if the issue persists.

  5. Verify SAML Configuration: Double-check your SAML configuration in the Firebase Identity Platform console. Ensure that all the required settings, including SSO URLs, audience URIs, and certificate details, are correctly configured.

  6. Monitor Network Requests: Use the browser's developer tools to monitor network requests and see if there are any error messages or unexpected responses during the SAML authentication process.

  7. Check Identity Provider Logs: If possible, check the logs and error messages from your SAML identity provider to see if there are any clues about what might be causing the issue.

  8. Contact Firebase Support: If you have tried the above steps and the issue persists, consider reaching out to Firebase support for further assistance. They might be able to provide additional insights and help troubleshoot the problem.

Keep in mind that software and browser behavior can change over time, so it's essential to stay up to date with the latest releases and official documentation from both Firebase and Firefox. Additionally, since my knowledge is based on information available until September 2021, I recommend checking for any updates or changes related to SAML authentication with Firebase and Firefox beyond that date.

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