Forgot to add software versions.
Enpass Beta 6.11.2 (1751)
Enpass Firefox extension 6.9.4.2
Windows 10 Home 22H2
Firefox 129.0.1 (64-bit)
Problem URL https://secure.rallycu.com/rallycu/uux.aspx#/login
The extension works fine for all other sites that I use...