Ok, I'm starting to figure this addon out and wanted to share how I am using it to get many tabs under control.

If you haven't figured it out already, to separate groups, you need to lock them. Then when you add a new tab to the list, it will go to it's own group.

I've been using multiple tabs addon to select multiple tabs to open in new window, then I use the send all tabs to specified group. It clears tabs out really fast.