Passwd Composer solves the problem of creating unique passwords for different sites, so that a compromise of one site doesn’t lead to all of your logins being compromised.

Password Composer combines a master password with the site name (using an MD5 hash) to generate a unique password for each site.

Sounds great, but if it were too cumbersome too use it wouldn’t have value. The magic of password composer is a Firefox extension or IE Bookmarklet that makes the master password functionality just a click away.