I just learned about Tab Groups. Reading the documentation, I envisioned them a little differently than how they actually operate. Rather than a colored underline for all tabs in a group, the tabs would get collapsed into the Group tab (which has whatever name you specified when you created the tab group). Then, if/when you click on that tab, all the tabs (their names) within the group are displayed below the group tab like a drop-down list (or like when you click the Bookmarks option from the menu bar). It's kind of like how the Bookmarks drop-down menu works, but provides a shortcut and is for pages/tabs that are already open. It would save on real estate with horizontal tabs, whereas the current implementation exacerbates it. Vertical tabs also chew up a lot or real estate. This new group tabbing method would save/reclaim real estate for both vertical and horizontal tab orientations while leveraging the benefits of both.
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