Firefox Quantum - scrollbar very thin

[Apanta]

Hello.
Use ubuntu 16.04 desktop-64 bit.
This morning, firefox updated to the Quantum 57.0 version (64 bit) and in the reboot I immediately noticed that the scroll bars (side and bottom, have become very thin, (around 3 mm thick).
I had previously installed a noia scrollbar bar, to increase the scroll bar thickness, for my visual needs.
Among the add-ons I find that the boredom extension has been disabled because it is not compatible with the new version of firefox. How can I overcome this in order to be able to adjust the slider width again? thanks for the sure help.
this is what I need:


Thanks in advance.

[vasa1]

Please don't try to post data urls. Use actual images instead.

[vasa1]

Create a plain text file called gtk.css in ~/.config/gtk-3.0 with the following content:

*{
-GtkRange-slider-width: 15;
}

This will affect all your gtk3 applications. If you want it to only affect Firefox, that will take some more work.

[Apanta]

I followed your suggestion and solved it immediately.
thank you.
How can I insert "solved"?

edit: found the way to insert : solved.
Thanks again.