Hi, Unfortunately Firfox doesn't maintain decent documentation about configs. The warning you received is just to alert people that they can mess thing up. But maybe this will help you.[1] But some of the info might be out of date.
Cheers [1] https://kb.mozillazine.org/About:config_entries > > > 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 > > > >
