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xB Browser (formerly known as TorPark and Xerobank browser) was a web browser designed to run on both the Tor and XeroBank anonymity networks, and is available as component of the xB Machine and the xB Installer.
In March 2007 it was reported that the xB Browser was downloaded 4 million times and in February 2008 over 6.5 million downloads making xB Browser the most popular anonymous browser on the Internet.
xB Browser works by routing Internet traffic through several "onion" servers, obscuring the originating IP address and encrypt the data. This does not naturally provide anonymity for other Internet programs, only the xB Browser. However, other applications data such as Pidgin can be routed through the Tor network via xB Browser by directing the applications traffic to a SOCKSproxy at localhost, port 9050. This port can be changed via xB Config, an INI generator for xB Browser.
Because of the complexity of Tor and its configuration, the xB Browser is preconfigured and requires no additional technical knowledge to use the Tor network.
xB Browser is optimized for use on the XeroBank anonymity network, which is a private and commercial broadband network operated by Xero Networks AG. The XeroBank network routes traffic through at least two multi-jurisdictional hops. In contrast to Tor, the XeroBank network supports both TCP and UDP protocols, performs channel multiplexing for low observability, is run by a single entity and costs money to use. The XeroBank network is accessible via SSH and OpenVPN protocols. xB Browser internally manages a SSH connection to XeroBank, but will recognize and submit to OpenVPN connections.