The Firefox scrollbar is very narrow on Ubuntu. This is very annoying. But since I am using the MATE desktop and GTK 3.0, I can fix this easily. Add this line to the ~/.config/gtk-3.0/settings.ini file, and this will force Firefox to use the scrollbar defined by the theme instead. gtk-primary-button-warps-slider=falsegtk-primary-button-warps-slider=false The file should look like … Continue reading How to fix the annoying narrow Firefox scrollbar on Ubuntu.