From their website: "surf is a simple web browser based on WebKit2/GTK+. It is able to display websites and follow links."^[1] Program tested: v2.0 for Linux. Mitmproxy was used to check for connections.

Spyware Level: Not Spyware

Surf makes no unsolicited requests at all. It is also fully libre software under the expat license. It was tested in conjuction with tabbed, another piece of software developed by the same people for use with surf, it adds support for tabs. From a privacy standpoint, this browser is an excellent choice.

Surf requires proxychains to connect to Tor, as it only supports HTTP proxies, not SOCKS (which is what Tor uses).