Repeating Fieldsets on Character Sheets Not Working

When I open a character sheet (any character sheet) with a repeating fieldset I can see the "+Add" and "Modify" buttons, but they do not appear to do anything when I click on them. I can see old entries I've entered into these fieldsets in the past. If I open Firebug and click on the "+Add" button I get the following error in the console: TypeError: document.activeElement.name is undefined This occurs in Firefox 35.0.1 running on Mac OS 10.9 (Mavericks). This occurs on production. I have not tested on the dev server.

Thorin, what sheet is this happening for, or is it happening on all character sheets with repeating fields?

I have noticed this with the HackMaster, Savage Worlds and my own custom character sheets. This leads me to believe it is likely happening with all character sheets with repeating fields.

Can you provide a console log of what happens when you try and create a repeating field?

As of this afternoon, I can no longer reproduce the bug when I go back to get the console log. I will play around with it a bit more later today to see if I can reproduce it somehow, but otherwise I guess you can ignore this.