Firefox 45.0.1
Fast Dial 4.14.2

When you right click on a page and select "Add to Fast Dial" the ">"  to add it to an existing folder goes missing.  Uninstalling/Reinstalling Fast Dial does not fix the issue.
I then restore Firefox from backup folder backup\AppData\Roaming\Mozilla,  and it works for a day or 2 and the ">" goes missing again.

Suggestions?