I love this add-on, helps me a lot tiding up all tab mess during study. Students, researchers, developers definitely must use it. Saved a lot of time when switching between work and study tabs groups. Everyday you use it more, more features you look for. I would like to see a nice keymap built around it then I could do magical gestures without going to mouse. tap! bam! posh!! tabs are archived and I created a new group in 3 seconds, wicked!