Ayatana Overlay Scrollbars call for help (QT, XUL, Chromium, etc)

Ayatana Overlay Scrollbars is a Ubuntu's relative new project that aims to provide more space to the user in a modern fancy enjoyable way.

Days ago, this scrollbars have received a new less rounded design (and many other things), but there are important applications that still use the "old" scrollbars (Chromium web-browser, Firefox, Thunderbird, LibreOffice, etc).

Yes, but, why?
"Despite our efforts to materialize our vision, there are many toolkits that need to implement them to provide a consistent experience across Unity" (Ayatana Overlay Scrollbars-related).

Ok, so, what can we do?
"We would be more than happy to assist anyone interested in this work stream, in particular: XUL, Qt and the web browser Chromium".

If you want to help with this implementation or if "you have any question related to the implementation and the technology used, don’t hesitate contacting our software engineer Andrea Cimitan".