I just started using it but I already ask "how could I have used the Net without it?". Some days ago I searched for Golden Age mystery writers and I ended up with: Group 1 Search engine results for search theme, authors, titles Group 2 Wikipedia pages for authors, bibliography Group 3 Amazon for reader reviews Group 4 BookDepository/AbeBooks for available books Altogether there were more than 60 tabs at one given time, which if open on the same window would be complicated to manage (I used to use List All Tabs but it's far from being as productive). How about you, do you use tab groups?