Identity Safe Does Not Autofill Passwords Anymore

I am running up-to-date Norton Security Suite 22.5.4.24 on Firefox 42. I updated NSS so now Norton Identity Safe appears on the toolbar.

But Identity Safe will not auto-populate user IDs and passwords on any websites. I made sure the "Autofill passwords" box in the Browsing tab is checked.

Identity Safe worked on previous versions of Firefox.

Is this a known problem?