Inspired by the Google’s encrypted web search, the Electronic Frontier Foundation (EFF) together with the Tor Project has just launched a new extension for Firefox called HTTPS Everywhere to ensure every search the browsers sent was encrypted.
Why this extension? For example, some websites like Facebook offer some limited support for encryption over HTTPS, but make it tough to use.
They may default to unencrypted HTTP, or fill encrypted pages with links that go back to the unencrypted site.
The HTTPS Everywhere extension fixes these troubles by rewriting all requests to these sites to HTTPS.