Review for Enigmail by Charles Boling
Rated 5 out of 5 stars
I've been using this plugin for a couple of years, and it works well. It makes it easy to set up and use gpg for email. It's unfortunate that so few people are aware of email encryption, and that PGP is not well supported natively in popular clients, specifically in the MS Windows world.
This review is for a previous version of the add-on (0.95.6).To create your own collections, you must have a Mozilla Add-ons account.