Infection Blocked! when opening up new tab.

Viruses and worms
1

Hey forum,

Whenever I open a new tab in Mozilla Firefox Avast! says that it’s blocked an infection. I took a screenshot of what it said, here’s the link:

http://postimg.org/image/bgjznxgax/

I’m using Avast! Free 2015 and the FireFox version that I’m using is 33.1

I found another thread with this exact or similar issue but I’d love to hear from the virus professionals to know that I’m secure.

Thank You so much!

2

https://forum.avast.com/index.php?topic=53253.0

For a virus check.

3

Well I ran MalwareBytes and it didn’t find anything. Could this have just been a false positive?

4
Based on the blocked address I would say that this are the recently introduced ads on the new tap page from Mozilla.
https://forum.eset.com/topic/3608-mozillacom-address-has-been-blocked/