I'm looking for a Firefox add-on to suggest passwords within the registration forms, much like what Chromium is doing:
Lastpass can do that. It keeps all your website passwords (and more) in one vault and you can (optionally) have it log you in automatically, and for new sites it can generate strong passwords (You set the strength, I recently changed it from the default 12 characters to 15).
Extended information e.g. Security Now podcast #256