HTTPS everywhere is a plugin which rewrites all your requests to HTTPS ensuring that you’re connecting to secure sites whenever possible.

It’s available for Firefox and today the first stable v1.0 got released.

You may want to use this plugin and recommend it to your friends, since there are still way to many people not using HTTPS to connect to pages, putting their credentials and data on risk. It’s quite easy to steal cookies and passwords when people are using non-secure log-on pages to services like social networks.