By default JxBrowser uses system proxy settings.
Windows
JxBrowser uses the same settings that MS Internet Explorer uses.
Mac
JxBrowser uses the proxy settings listed under the Network Control Panel. These are the same settings that Safari uses.
Linux
JxBrowser uses either GNOME/KDE proxy settings, or will use certain environment variables.
When you modify JxBrowser proxy settings you don't modify the system global proxy settings.