> - harder navigation as now I need an extra "bookmarks" UI instead of existing tab lista

This is an HN thread about an extension that offers extra UI to save, manage your tabs. It's evident that the one-line-of-tabs UI is not enough for your use case.

Bookmarks already definitely have better UX for organization, they can even be renamed, tagged, searched… natively!

> Did you notice the word 'sessions' in the title? That's for organizing

My point is that you can store your "sessions" in a bookmarks folder. Browsers have made it excessively easy to "save all tabs" and "open all bookmarks" already. "Saving a tab session" is literally indistinguishable from "Saving all tabs as bookmarks", you're just duplicating a native browser feature by installing a 3rd party extension that has access to your entire browser history.