More of building this has been deciding what not to build than what to build. The cuts, and why.
AI that sorts your tabs for you. The obvious feature, and the research says people dislike it. Built-in browser AI grouping sorts by topic and mis-groups constantly; the reviews on tools that force it are unkind. The mismatch is structural — AI reads content, people work by project, and those aren't the same thing. So the human names the task. Any AI here assists after that decision, never instead of it.
A web app. I'd planned one, then realised I was conflating two things. Sync needs a server. It doesn't need a website you log into. A browser extension can open its own full-page view when it needs width, which is the same code and the same data with nothing to host. The site you're reading exists to explain the product and handle billing. It is not a place to manage your tabs.
Storing a thousand pages forever. Some tools optimise for the person with a thousand saved links, and then get slow, and then get complaints. That person wants bookmarks. This is a triage tool — pages come in, get sorted into tasks, and leave when the work is done. It's meant to empty itself. Designing for the archive case would have broken the thing that makes it useful.
Hierarchy beyond one level. Folders hold tasks, tasks hold pages, and that's the end of it. A folder can never hold a folder. One browser team published usage numbers before winding their product down: only about 5% of daily users regularly used more than one workspace, and about 4% used their nested-folder feature. Elaborate structure is a thing almost nobody touches, and the tools that lean on it get complexity cited as the reason people left.
The original pitch. For a while the headline was about remembering what you were doing when you came back to a task. It's a real feature and it's still in there. But it wasn't the point. The point is a browser that isn't fighting you and a day that has a shape. That's an organisation tool, not a memory tool, and the copy now says so.
Dragging a tab from the tab strip. Not a decision, just reality. The browser doesn't hand tab drags to extension side panels. Dragging a link out of a page works fine and stayed; the rest came out rather than shipping something half-real.