I'm a tri-focal wearing octogenarian with vision/perception issues.
As I started out in days of Netscape Navigator I eventually ended using
SeaMonkey, having over the years chosen settings that accommodate my needs.
As Firefox comes as default browser with Debian Linux, I use it as my
backup browser when a website chokes on my default settings and/or
SeaMonkey itself.
I have problems with its defaults for the vertical scroll-bar.
I asked on alt.comp.software.firefox.
I was told to modify about:config .
Suggested settings were:
layout.testing.overlay-scrollbars.always-visible true
widget.non-native-theme.win.scrollbar.use-system-size false
widget.non-native-theme.scrollbar.style 4
widget.non-native-theme.scrollbar.size.override 20
I had no qualms about the first.
But Firefox has a warning when you access about:config saying:
Proceed with Caution
Changing advanced configuration preferences can impact
Firefox performance or security.
Based on having decades in engineering support I paid attention.
I don't know the implications of "non-native-theme" and "win" above.
Asking for pointer to Firefox documentation I was told "Don't worry..."
Suggestions?
TIA