HTTPS Everywhere is a Firefox, Chrome, and Opera extension that encrypts many of your communications with most major websites to make your browsing more secure.
It automatically switches thousands of sites from insecure "HTTP" to secure "HTTPS". It will protect you against many forms of surveillance and account hijacking, and some forms of censorship.
Version History for HTTPS Everywhere for Firefox, Chrome & Opera): https://www.eff.org/files/Changelog.txt