If you have installed tor on your local machine, you can use an add on like proxyswitch omega (firefox and chrome) to redirect all onion websites. For a networ

If you have installed tor on your local machine, you can use an add on like proxyswitch omega (firefox and chrome) to redirect all onion websites. For a network wide approach, you will need to set up PAC and a network accessible tor proxy. The PAC would have a rule that redirects all .onion hosts to the network accessible tor proxy.