Privacy Browser 3.3 introduces the option to select a custom proxy in the format of
scheme://host:port as described in the ProxyConfig.Builder documentation. There are two preconfigured options, one for Tor which uses
socks://localhost:9050 and a second one for I2P which uses
Selecting the Tor or I2P options produce an error message if the official app for those services is not installed on the device. If you are using a third-party app to provide access to those networks, you should use the custom proxy option.