Hi
I noticed that the behaviour of of two pc's running side by side, (both with recent licences installed) internet security protection was slightly different.
So I checked the add-ons/extensions on the firefox's and indeed they are two different versions.
Avast Internet Security 10.1.0.170
Avast Internet Security 10.2.0.187
I tried to update from firefox buttons and it says all up to date.
Confused :/