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An alternative vertical tab bar I discovered some time ago is Tab Center (https://testpilot.firefox.com/experiments/tab-center). Although still a little buggy, I switched over from Tree Style Tab. It feels better IMO and I really didn't care about the "tree style" of TST, I just felt the need for a vertical tab bar.

Wow, I just tried it, and it's the tab interface I always wanted. More vertical space for reading web pages, and wider tabs to read the tab titles more easily. Why isn't this the default yet?

A lot of people are wondering why this is not the default. If you like this you should try Tree Style Tab ;)

I tried it and unfortunately no nested tabs :/

I must admit I don't really understand the use case here. (Vertical, obviously, because you can exploit the wide screens we "all" have.) Can you explain why you want nested tabs?

Using Tree Style Tab myself and forced multiprocess. Sometimes when I close a tab, it folds some other tabs into it, but they are still active and you can alt + tab to them, but not visible in the UI. Not that it bothers me too much, since activating multiprocess gave me a huge performance increase

It is, and so is Tab Tree, which I found more lightweight.

it is! https://www.arewee10syet.com/

(you have to search the extension you want)