What do you like better about it? As a chromium user, I’d be happy just to have a TST option that sits in the same window, not a separate window that causes focus issues.

For me, it was the discovery that most of my browser slowness was due to TST, and Sidebery didn't have that problem.

Probably only a problem for people with lots of tabs.

This looks great - thanks for sharing.

Is there an equivalent extension for Chrome that you know of?

Nothing as good as Sidebery for Chrome. But if you want to consider Edge, it has a great built-in implementation for vertical tabs.

Vivaldi does vertical tabs really well.

Last time I tried Vivaldi, it did vertical tabs, but they weren't nested. I find it useful to be able to get a nested tree structure of tabs that show where the tab I clicked came from.

just what I was looking for. being able to turn off the tree structure.