Follow the "Always Show Scrollbars" switch option in GNOME Settings when running GNOME

[amethystgosling]

So this one option for toggling overlay scrollbars for all GTK apps that support overlay scrollbars also works in Firefox it is shipped with almost all GNOME-based distros. This option is in the GNOME Settings under Accessibility > Seeing. The dconf key for the preference is org.gnome.desktop.interface overlay-scrolling .

[Jon]

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[amethystgosling]

Do remember if Firefox were to follow this preference, the "Show Scrollbars" toggle should be hidden from Firefox settings while running in GNOME.