Configuring the proxies

Configuring the proxies in Firefox

In the Extras-menu select Options, then Advanced (the rightmost option), then Network:
Firefox Options Advanced
Click on Settings… and in the following window select Auto-detect proxy settings for this network:
Firefox Proxies
Click OK.

Configuring the proxies in Microsoft Internet Explorer

Open the Control Panel and select Internet options or select Settings… from the Internet Explorer's Extras-menu. Select Connections in the newly opened window:
Internet Options
Click on LAN settings and check the box next to Automatically detect settings:
Internet Options LAN settings
Click OK.
It may be necessary to restart the Internet Explorer before the changes take effect.