https://www.eff.org/deeplinks/2010/0...efox-extension
"Today EFF and the Tor Project are launching a public beta of a new Firefox extension called HTTPS Everywhere.
This Firefox extension was inspired by the launch of Google's encrypted search option. We wanted a way to ensure that every search our browsers sent was encrypted. At the same time, we were also able to encrypt most or all of the browser's communications with some other sites."