FireGPG is one of the finest extensions under MPL for Firefox. It features an interface to encrypt, decrypt, sign or verify the signature of text in any web page using GnuPG. In addition, the extension can add some features to the Gmail interface that let us use GPGs features directly in your webmail and more webmail applications can be added in the future.

Click to know about Tiny Menu Addon

Moreover, it is able to detect PGP blocks in any page and let us easily manage these different blocks. The API of FireGPG allows us to design a website that normally employs GPG’s feature on the client.
As FireGPG is not a key manager. You must install the GnuPG software. If you are using Microsoft Windows, you have to download WinPT and GPG, and install it at the default location.

Click to SOURCE and DOWNLOAD the Addon

[ More ]