Comment 12 for bug 23369

What you said applys to the mozilla default setttings. I think we can give a
specail consideration to system preference settings. For example, if users
choose to use system http proxy, and they find mozilla is still using the http
proxy set locally in mozilla. that will be stange.
I think all applications should use system prefs if they choose to do that. In
that way the whole system looks more integrated. Furthermore this is useful for
system administrator to control the settings system wide. At last, user can
override the system setttings in another way, by choose not to use system
settings in mozilla prefs.