Simple to implement Stacked Tab Management
Can we have a "Rename" dialogue box when bookmarking a tab stack?
Thus groups of tabs with which one is working, can be saved, identified, and reloaded etc so you can de- clutter the tab bar.
Firefox has an add on that groups tabs, and displays them as a single groupTab in a second tab bar. Selecting a different groupTab closes all current pages and opens those of the different group ( no pages are lost). groupTabs can be suspended/hibernated/deleted/bookmarked etc etc