HTTPS Everywhere – Firefox add-on

    The Electronic Frontier Foundation and The Tor Project have teamed up to offer a Firefox add-on that brings Https to even partial ssl enabled sites

Many sites on the web offer some limited support for encryption over HTTPS, but make it difficult to use. For instance, they may default to unencrypted HTTP, or fill encrypted pages with links that go back to the unencrypted site.Like the way google does.

The plugin currently works for:

    Google Search
    Wikipedia
    Twitter
    Facebook
    The New York Times
    The Washington Post
    Paypal
    EFF
    Tor
    Ixquick

you can download the plugin from here

HTTPS Everywhere uses small ruleset files to define which domains are redirected to https. The documentation can be accessed from here