@ansuz Essentially what I need is temporal and positional context; which tabs were opened approximately when, and in relation to what else? And this needs to be tracked automatically with no extra effort from my side. Which is pretty much what tabs do, but bookmarks don't.

Folders don't really fix this because you explicitly need to manage them, and I've actually *tried* using those for this and it mostly just ended up breaking Firefox with the amount of bookmarks I accumulated. Apparently it has trouble rendering the menu now...