How do I use Panorama / Tab Groups with the keyboard?

Yes I know that CTRL-SHIFT-E opens the panorama window, and then I can use the mouse to organize my tabs into groups. But how do I do this with the keyboard? I've [http://lifehacker.com/#!5719596/switch-between-tab-groups-in-firefox-with-a-keyboard-shortcut read] [http://ubuntuforums.org/showthread.php?t=1705714 that] Ctrl-`should move me through tab groups. That doesn't work for me on my Danish keyboard. (Where the ' and ` chars are weird. But is how they are on a valid standard Danish keyboard) I've tried changing the keyboard to USA and then moving through tab groups works fine. In short: Pretend I don't have a mouse. How do I use Panorama / Tab Groups?