Add-on doesn't correctly sync masks

[hobbsd]

I have Relay Premium with 16 email masks. The Firefox Relay add-on at first only showed 6 masks -- the Search bar said "6/6" and the Stats tab said "total email masks used 6". So I uninstalled and reinstalled the add-on, then it correctly had 16 masks. Now the add-on only shows 10 masks.