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How to fix the annoying narrow Firefox scrollbar on Ubuntu.


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=false

The file should look like this.

[Settings]
gtk-application-prefer-dark-theme=0
gtk-primary-button-warps-slider=false

Then, Firefox will be easier to use on Linux. GTK makes this very easy.

Open a GTK application like Pluma with this environment variable set, and it will force that application to use that theme.

env GTK_THEME="BlackMATE" /usr/bin/pluma

Control which GTK theme a specific application uses on Linux.

https://securitronlinux.com/debian-testing/control-which-gtk-theme-a-specific-application-uses-on-linux/.


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