I'm on NixOS (using Firefox) here, and I could log into my Chase account just now. I don't think I have anything special installed. 

Different user agent perhaps? Or a DRM component like widevine?

While you were replying I tried my backup laptop with Ubuntu. It worked flawlessly. I cannot log in with NixOs. 
That seems really weird. 

siggy47

Could simply be a matter of it not being worth their time and effort to maintain whatever functionality would be required for the site to work with Linux. Maybe it is simply a matter of not enough people using Linux for it to be worth their IT depts time.

opensource

Chase Bank Bars Linux Desktop Log In For Security Reasons?

Could simply be a matter of it not being worth their time and effort to maintain whatever functionality would be required for the site to work with Linux. Maybe it is simply a matter of not enough people using Linux for it to be worth their IT depts time. 