One minor nitpick: Firefox has vertical tabs, they were recently added in version 131 nightly builds. (Blog was probably written before it was added)
Also Edge/Vivaldi have sidebar/vertical tabs, but they don't nest which reduces their utility in my opinion.
The Miller Columns view implemented in a recent HN post[1] would be great way to view history. Each column could be linked visually with its sidebar tab. I use my sidebar tab tree structure to give additional context on what I've viewed, I can see that page G is a child of B, etc.