That tree tabs sounds awesome. I'm using container tabs already and it's greatly helped my tabs become less of a mess. But keeping them organized based on which tab I spawned them from sounds great, too. And tbh, it not hiding the original tab bar sounds even better because then I can combine the organization of container tabs with the historical origin of the tabs from tree style tabs and just use whichever one feels more intuitive in the moment to find the tab I'm looking for (or to traverse open tabs for cleanup).