Windows/Mac/Linux (Firefox): The Secure Login Firefox extension adds an extra layer of security to your saved Firefox usernames and passwords. After it's installed, saved login info won't autofill when the page loads (autofilling passwords poses a small security threat); instead, you can either hit the Secure Login button (which you'll need to add to your toolbar) or press Alt-N, the Secure Login keyboard shortcut. Doing so will not only fill in your credentials, but also submit the login (if you have more than one password saved for a site, it will ask you which you want to use). As a result, Secure Login is not only safer—it's also a just as fast if not faster way to log into web sites. Secure Login is free, works wherever Firefox does.
For add on:
http://beupdated.blogspot.com/2007/0...h-firefox.html