xulrunner introduced massive changes to nsLoginManager.js.
See:  https://blog.mozilla.org/dolske/2013/08/21/a-change-in-password-manager/

This change results in such bugs as seen here:
http://librelist.com/browser//conkeror/2013/11/28/login-manager-xulrunner-24-0/

I have implemented a PoC for this new behavior. You can find it here:
- https://github.com/thorkill/config-conkeror/blob/master/dot.conkerorrc/001-login.js