https://community.quicken.com/ "LOGIN"
From Firefox "LOGIN" get this link:
https://signin.quicken.com/signin/signup?response_type=code&client_id=quicken_estore&redirect_uri=https%3A//www.quicken.com/qam-callback
From Chrome "LOGIN" gets this link
https://signin.quicken.com/signin?client_id=vanilla_sso&response_type=jwt&redirect_uri=https://community.quicken.com/entry/connect/JWTSSO
This is why the login from Firefox to the Quicken Community does not work from Firefox.