Once you start thinking beyond the single-row paradigm, there are lots of ways they could expand on the concept. Ideally, though, other browser makers would take the idea and run with it. Vivaldi’s approach is so clever that it’s making me contemplate switching back to it as my primary web browser. But because Chrome and Edge group everything into a single row, you still end up with too much clutter. In all three browsers, you can group tabs together by dragging one slightly on top of the other (enabling this in Edge requires some extra steps), and both Chrome and Edge let you collapse a group until you need to access its contents. Vivaldi’s stacking feature does bear some resemblance to the existing “Tab Group” feature in Google Chrome and Microsoft Edge. You can also name each stack (by right-clicking and selecting “Rename Tab Stack”) to help remember what’s inside before clicking. Two-level tab stacking solves the problem by showing all your tabs when you click on a stack. To me, it required too much hovering around and slowed down the process of switching between tabs. Although Tab Stacking was one of Vivaldi’s original features, I never cared much for that particular iteration, which used pop-up menus to show the contents of each tab group.

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