Better coop with TabGroupManager Addon
TGM short explained grouping many Tabs in seperate Tabs (like a new seperate Firefox Window only in the same Firefox as a Tab).
Problem if normal Tabs are folded up by Tabkit and you change the group Tab by TGM and change back the normal Tabs are folded down.
There were a coop with TGM great.
eat more meat commented
Better to focus integration effort on TooManyTabs