When adding a source in Firefox, if details need to be added those details are not displayed
Using Chrome it does work as expected:
I just went and tested it, and it's working fine for me.
(Firefox 114.0.2, Win10.)
Have you tried the usual housekeeping steps? (Make sure the browser is up to date, and clear your FS-related cache and cookies.)
Browser up-to-date, Cookies cleared.
I had not cleared my cache (I thought I had by using ctrl-F5) but I went into setting and cleared all Site data.
It is now working correctly, Thank you.