TST is great, but it's nothing like Edge vertical tabs, which contain exactly the right amount of functionality for zero friction use. I have tried to get the same effect in Firefox, Vivaldi, pretty much anything that isn't Edge, but I keep coming back to Edge because it is so central to how I use the browser at a basic interaction level and, simultaneously, so simple to use that I can put up with (and deactivate) the other annoyances.

When you add "groups" (e.g., folders) it is magical.