I use avant browser too. I love it
I also used crazybrowser (aka ambrowser)
and I loved that programm too.
Now I'm using avant browser and my girlfriend is using crazybrowser.
So, our opened links don't disturb the other.
When you think the avantbrowser is too crowded, look at the preferences
and turn off some options.
I bet if I want I can make FF crowdier than AB !.
BTW: I don't love FF.