I feel like there's some paradigm we haven't reached yet. As the parent said, bookmarks and history are just 2 different views of the same underlying data and tabs provide an isolation of the context
If we go back to the root of what the web is, we have a graph where nodes are documents and edges are a user clicking on a link at a given time, and the user wants to keep a few of the documents in the current context. So not only is there's a graph, which is not easy to represent and navigate, but the edges depend on time. Maybe some VR thing can help us see something new here
We could generalize further and say that's what the entire window manager of an OS represents. Though, there's a difference between 'currently loaded' and just the address, and for less-than-high-end computers, that difference can mean a lot.
That graph also contains a lot of noise - e.g. documents that aren't needed. I wonder if VR would help, by letting us see more, or if that better paradigm could also be implemented on 2D screens.
There's already various graph visualization tools. But the tricky part would be wrapping that up into something useful - like a tree graph vs. tree style tabs. And if this would be more than 1-dimensional, like TST, then it would likely have to be a full page.
If we go back to the root of what the web is, we have a graph where nodes are documents and edges are a user clicking on a link at a given time, and the user wants to keep a few of the documents in the current context. So not only is there's a graph, which is not easy to represent and navigate, but the edges depend on time. Maybe some VR thing can help us see something new here