If you want to make sure your web surfing always uses and forces websites to use HTTPS (encrypted connections) to prevent ne'er-do-wellers from sniffing your surfing, logins and other info you might enter while using the InterWebbings.. Then use FireFox and add EFF's add-on 'HTTPS Everywhere' and poof! If a site has HTTPS, this little add-on will force it to use HTTPS... Handy, oh yeah.. Donate them some $$$$, they fight for our Internet rights!!!
EFF website download