Problem is that it's too narrow, makes it hard to click. That's why I'm specifically looking for a native widget.

In about:config

  widget.non-native-theme.scrollbar.size.override 20 
  widget.non-native-theme.scrollbar.style  4
  widget.gtk.overlay-scrollbars.enabled   false

I even use a custom gtk.css to improve things further:

  scrollbar, scrollbar button, scrollbar slider {
    -GtkScrollbar-has-backward-stepper: true;
    -GtkScrollbar-has-secondary-forward-stepper: true;
    -GtkScrollbar-has-forward-stepper: true;
    min-width: 20px;
    min-height: 20px;
    border-radius: 0;
  }

It's a shame we have to resort to this to get decent scrollbar behavior.

Thank you! How the hell is anyone supposed to discover things like this?

Software should include documentation, which should mention all of the commands used there, so that you can know how to do it. Unfortunately, many of the settings are not very well documented, and the document is hard to find.

Good luck designing a UI that includes settings for scrollbar width and other settings of that granularity in which any of those settings are discoverable...

> Good luck designing a UI [with] settings for scrollbar width and [similar] in which any of those settings are discoverable...

Like Windows XP?

ref: https://www.simplehelp.net/2009/08/04/how-to-enlarge-or-shri...

Exactly. Admittedly I was a lot younger then, but I had a hard time finding even relatively simple options in the nested menus and tabs of Windows XP.