I keep 4 or 5 sites open in a normal browser all day just for quick checks - dashboard, shared doc, a chat app - and they eat tabs and steal focus every time I alt-tab past them. Moving those into the menu bar instead of a browser window is such an obvious idea once you see it. The split side-by-side view is genuinely useful too, I use it to keep a doc open next to a dashboard without needing two full windows tiled on screen.