passport saml always redirects to chrome middleware page instead of web browser middleware instructions

Hi, I've read on the website that the eID Provider now supports multiple browsers via the 'Web Browser Middleware', but it seems like the saml passport example in this repo always refers to the chrome specific url: https://www.e-contract.be/eid-idp/chrome.xhtml

(even in firefox & safari)

Is there a fix / proposed solution for this so we can support multiple browsers with node.js ?