Firefox GTK3 - scrollbars

[FLHerne]

In FF 43 with GTK3 (on Archlinux), the scrollbar track extends further than it should, behind the up/down arrows. This leaves a section of empty track visible at the top even when the page is scrolled all the way up (same for the bottom).

The scrollbar is also too narrow.

EDIT: Picture (page at top).

[ghost]

Looks like I need to compile a list of bugs for the Firefox devs concerning their theming implementation on GTK 3. It appears rather rudimentary/broken at the moment.

[FLHerne]

And then this happened.

EDIT: This now happened once also on GTK2, so probably isn't a theme issue.

(twitter.com)

[guoyunhe]

Some Java Swing applications with GTK look and feel have similar problem.