Can't live without this addon! Rated 5 out of 5 stars
So happy to see that this is now working with Australis (UI overhaul) on Nightly Firefox. Here's a small bug I've noticed when going to customize the toolbar: http://cl.ly/image/2m2b072R2s3V the tree style tabs become temporarily tabs-on-top
Thanks for all your work on this, I use so many tabs throughout a given day - especially in bug triage - that this addon makes gtd possible.