Rednose
2
Hi SlyFox 
Avast Safezone doesn’t use Google Chrome, but Avast’s own custom build of the open source webbrowser Chromium :
https://en.wikipedia.org/wiki/Chromium_(web_browser)
And Google Chrome is also based on Chromium.
So the SafeZone webbrowser and Google Chrome are two different webbrowsers, only based on the same code.
Whatever default browser you use, it doesn’t matter.
That said, I see that you are using MBAM Pro, and I am curious if the SafeZone webbrowser is working with you ?
A note : In Avast 2016, SafeZone will be replaced by something new which also includes SafeZone, but in a different way.
Greetz, Red.