Vertical tabs - lot of users want it, but chrome devs close the feature requests.
Ah, ok. They are however available in Firefox as an extension, aren't they? Or at least that used to be the case
I tried the Vivaldi version of this a few months ago and it unfortunately does not meet the feature set of Tree Style Tabs. It isn't a worthwhile alternative, for me.
Such as? I find it less customizable than Firefox or Chrome