automatic tab stacks by host
so when you open a new tab, i'd suggest it goes under the tab stack of the same host, this works for me since there's no easy way to add all the remaining tabs on a per-host basis. and i need to ungroup and regroup by host constantly. and to put it bluntly is a bit of a pain in the ass.
This sounds related to a bug I filed a while back - VB-50944
Can't stack tabs by host to a stack already containing that host
However that bug is as yet unconfirmed