Review for Enigmail by Ayishah
Rated 5 out of 5 stars
Served me well in creating my PGP keys, signing & encrypting my email, and managing my keys. I'm looking forward for further enhancements, as well as support for SeaMonkey 2.0 Beta.
It's a very useful add-on. I'd recommend this to security-conscious people.
To create your own collections, you must have a Mozilla Add-ons account.