Called HTTPS Everywhere, the free add-on is the result of a collaboration between the Electronic Frontier Foundation (EFF) and the Tor Project.
Sites with which the software works include Google, Wikipedia, Twitter, Facebook, Paypal, as well as content sites such as The new York Times, The Washington Post, and the EFF and Tor. Based on the Strict Transport Security (STS) evangelised by the team behind the popular security add-on Noscript, the HTTPS mode is identified with a padlock icon. It is also possible to write custom rulesets for others sites, say the creators.
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