Heavy tab users want vertical tab organization with grouping that the browser does not give them

Demand for vertical tabs is large and recurring across tools: VS Code's request has 699 reactions and 181 comments, Brave's has 294 reactions and 266 comments, and newer browsers keep getting fresh requests for it. Power users who keep dozens of tabs open struggle with a horizontal tab strip that truncates titles and makes switching slow. They want a vertical, groupable, searchable tab sidebar. For browsers that lack it natively, this is a clean extension opportunity: a vertical tab panel with grouping, search, and session save.