Go into "about:config", search for "scroll", and make these changes:1. Change "widget.gtk.overlay-scrollbars.enabled" from "true" to "false".2. Change "widget.non-native-theme.gtk.scrollbar.thumb-size" from "0.75" to "1.0".3. Change "widget.non-nativ...
I found a method that partially works: Go into "about:config", and find setting "widget.non-native-theme.scrollbar.style", and change its value from "0" to "4". That worked for me, on Firefox 103.0.2 on the "Manjaro-KDE-Plasma" Linux distro. It doesn...