Shameless plug.
I made the ContainerTabsSidebar firefox addon[0], which is inspired by the TST. It groups tabs based on firefox privacy containers, which means every container has an isolated cookie store. I'm a tab hoarder and developed it to work for such "use-case".
It's very similar to the groups presented, but displays tabs vertically.
It's very similar to the groups presented, but displays tabs vertically.
[0]: https://addons.mozilla.org/en-US/firefox/addon/container-tab...