I love that workflow-oriented browser ideas are popping up. Funny enough I just ran into Sigma OS browser earlier today, but haven't tried it yet: https://sigmaos.com/
That looks pretty cool. Some kind of combination between SigmaOS and Bonsai would seem especially interesting and useful.
(Side note: "SigmaOS" initially made me think it'd be an operating system. And "Bonsai Browser" reminds me a tiny bit of everyone's favorite purple monkey helper/[ad|spy]ware, Bonzi Buddy. Especially with the top of the page landing page saying things like "Use a hotkey to make bonsai appear anywhere". I don't actually think anyone would ever possibly confuse the two, but just an amusing thing that came to mind.)
