HTTPS Everywhere - Chrome extension that encrypts and secures your browser
Smart HTTPS - Automatically changes HTTP addresses to the secure HTTPS, and if loading encounters error, reverts...
KB SSL Enforcer - This extension enforces encryption for websites that support it as much as currently possible in...
HTTPS Only - Encrypt the web and stay safe
ForceTLS - ForceTLS allows web sites to tell Firefox that they should be served via HTTPS in the future; this...
HTTPZ - HTTPZ is meant to be unobtrusive and lightweight.