Display issues with GTK applications

After one the last package updates my GTK-based applications (especially firefox) started exhibiting display issues. Like checkboxes being present (mouse cursor is changing its shape when hovering over them) but not visible.

It turned out this was and issue with an update of the GTK package.

The fix itself is pretty simple :

Just change "Breeze" to "breeze" in ~/.config/gtk-3.0/settings.ini