There’s a new Firefox add-on, HTTPS Everywhere, jointly developed by Tor and the EFF. If a website has an SSL certificate, the add-on will automatically redirect the user to the page’s https address. The add-on comes loaded with a default ruleset for some of the more popular websites such as Google, Twitter, Wikipedia, etc. HTTPS Everywhere allows users to create their own redirection rules with XML and regular expressions. There’s another H write-up here.