Rated 5 out of 5 stars
I never used Firefox's master password feature, it was too risky. Viruses and trojans could read the passwords stored in Firefox, it was a security risk. However, seeing as my system already uses KDE Wallet, I don't see why this wouldn't be an useful feature! Maybe I can finally not remember my passwords. I only wish it remembered usernames too..This review is for a previous version of the add-on (0.4).
What it does remember
It remembers user names and passwords. Even if you have more than one username/password combination for the same site.