Wy don't you go thru: http://forum.avantbrowser.com/
You might find an answer there...
Don't know if they're still developing the Avant Browser. I was very fond of the browser until I started experiencing hyperthreading problems. Browser using 100% CPU time, hanging, freezing.... Pity.
The Orca Browser they develop did not work out for me either.
Went over to Maxthon browser; sort of the same compared to Avant and not freezing or hanging. Surfs in tabs as well and saves tabs when closing the browser.
I'd preferred Avant cause of it's nice features though!