Review for Saved Password Editor by Sighurt
Rated 4 out of 5 stars
If people want to use add-ons to collect passowrds, they'll make a useful add-on that doesn't even mention passwords (for example an add-on that adds useful extra buttons) and make it collect and send the passwords.
Every add-on is a security risk. And I think this add-on is useful.
To create your own collections, you must have a Mozilla Add-ons account.