This interface allows the proxy code to use platform-specific proxy
 settings when the proxy preference is set to "automatic discovery". This service
 acts like a PAC parser to netwerk, but it will actually read the system settings and
 either return the proper proxy data from the autoconfig URL specified in the system proxy,
 or generate proxy data based on the system's manual proxy settings.
[scriptable, uuid(a9f3ae38-b769-4e0b-9317-578388e326c9)]
interface nsISystemProxySettings : nsISupports

Attributes

 If non-empty, use this PAC file. If empty, call getProxyForURI instead.
readonly attribute AUTF8String PACURI

Methods

 See nsIProxyAutoConfig::getProxyForURI; this function behaves exactly
 the same way.
AUTF8String getProxyForURI(in nsIURI aURI)