SSO JavaScript Integration

I need JavaScript for SSO to enhance web page speed loading.

Requirements:
- SSO integration using OAuth, SAML, or OpenID Connect
- Compatibility with Firefox is a must
- Ideally, the solution should improve user experience, boost SEO rankings, or reduce bounce rates.

Ideal Skills & Experience:
- Strong JavaScript proficiency
- Experience with SSO protocols
- Web performance optimization expertise
- Cross-browser compatibility testing, especially with Firefox

Please provide a portfolio with relevant experience.