ATT.net is incomplete with Online Security enabled?

[TSquare]

I have tried this on my Vista machine and 2 other Windows 7 machines. Using Firefox 25.0.1, IE 9 and IE 11 have no problem. Avast Online Security 9.0.2006.53 Add On.
Attachments show the difference between the add on enabled and disabled. Any ideas on how to get a complete page in Firefox with the add on enabled? So far ATT.net is the only page that I have found that does not complete.

Enabled: main graphic is missing
Disabled: main graphic is there.

[Staticguy]

Use this https://support.avast.com/Tickets/Submit

[TSquare]

Thanks Staticguy, I will give it a try.

[TSquare]

Apparently an update has resolved this issue. Thanks.

[Staticguy]

Your welcome