Tree style tabs (Firefox) works in much the same way, assuming you have a parent tab for each group. I routinely start a research task from one tab, say a sear

Tree style tabs (Firefox) works in much the same way, assuming you have a parent tab for each group. I routinely start a research task from one tab, say a search query, open all interesting results in sub tabs and close the parent tab including all children (ie the group) once I'm done (or I collapse the group when I intend to resume later).