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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 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.