HTTP Nowhere is described as 'Redirects websites that uses HTTP to websites that uses HTTPS' and is an app in the Web Browsers category. There are eight alternatives to HTTP Nowhere for a variety of platforms, including Mac, Windows, Linux, Firefox and Google Chrome. The best alternative is HTTPS Everywhere, which is both free and Open Source. Other great apps like HTTP Nowhere are Smart HTTPS (Free, Open Source), KB SSL Enforcer (Free, Open Source), HTTPS Now (Paid) and ForceHTTPS (Free, Open Source).
This extension enforces encryption for websites that support it as much as currently possible in Chrome. This gives you added security and privacy for your browsing automatically and transparently. This is particularly important on insecure networks, such as public wifi in e.g.
ForceTLS allows web sites to tell Firefox that they should be served via HTTPS in the future; this helps secure you from accidentally negotiating an insecure session with certain sites. Force-TLS is also compatible with Strict Transport Security.