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.
Vertical tabs don't nest; however, you can group them using Chromium's native groups. In Brave, I can also assign custom keyboard shortcuts, so I have Ctrl+G for starting a new group, and Ctrl+T for opening a new tab in the same group.
I've also been a user of Firefox for years, and the tree-style tabs extension are all slightly broken, enough to make me disable them. I also never found much value in nesting.
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.
[1] https://news.ycombinator.com/item?id=41263203