> it has by far the best vertical tab implementation of all browsers (someone please copy this)

TIL. I think it's still far behind TreeStyleTabs (TST) on Firefox. Missing for me:

- No nested groups. I know it's called vertical and not tree, but branches offer more context when navigating deep.

- Groups are standalone containers, while in TST the group is the root tab. This saves space but also allows to close/CTRL-F4 a tab to close the group/branch.

- Open in a new tab adds the tab at the end of the group, loosing context. There might be an extension for that.

- Closing a group and all its tabs requires to open a context menu.

- No automatic collapse behavior when selecting other groups and there are lots of tabs open.

- Open in a new tab doesn't create a group automatically, they must be manually initiated. Killer feature for me: by the time I realize I should have created a group it would be too late to bother assembling one.

- Scroll-wheel up/down doesn't quick switch tabs. Killer feature for me.

- Drag'n'drop zone to create a group VS reorder tab action is very small and hard to hit.

Nice feature though. I'm kind of amazed they bothered to implement this yet flat out refuse to re-enable the vertical taskbar lost with Windows 11.

But it has 2 features that are unique:

- You can hide the titlebar/tab-bar at the top therefore maximizing vertical space

- It can be set to either be sticky (always open) or auto-collapse into a thin icons-only vertical toolbar.

The grouping functionality in Edge is inherited form Chrome without improvements.

The grouping functionality in Firefox with TreeStyleTabs or Sidebery is unmatched but this is all implemented by extensions and Firefox abandoned a lot of interface customizability when it abandoned XUL extensions. (you can theoretically do it by hacking userchrome, but it's buggy)

With old XUL extensions, TreeStyleTabs actually had the option to hide the tab-bar. And you also had the option to move the window controls to one of the toolbars.

Vivaldi does have the option to use vertical tabs but you are left with a titlebar you can't hide.

Yes, BUT number 1, it is fast.

I use Firefox + vertical tabs reloaded as TST was too slow for me and adding tabs is much slower when you have lots open.

Edge vertical tabs implementation flies in comparison.

> -it has by far the best vertical tab implementation of all browsers (someone please copy this)

Brave is copying it. Still WIP, but it's starting to get really good.

Turn off the tab scrolling flag if you have it set, set the bookmarks bar to be always on so window height is static (otherwise tabs will jump around when you grab them), and turn vertical tabs on in flags. Not quite as smooth as Edge's yet, but it's getting there.