This is the Cryptofox add-on. It contains:

• A program (lib/main.js).
• A few tests.
• Some meager documentation.

• GnuPG
• libgpgme11

If you are on 64-bit linux, but running a 32-bit firefox, you may run into the issue where the libs cannot be loaded. If this is the case, you need to use getlibs to install the 32-bit versions. For example, if gpgme cannot be loaded, you might do:

Install the 32-bit version:

$ sudo getlibs -p libgpgme11

Make a symlink from the library to the name the plugin is looking for:

$ cd /usr/lib32

$ sudo ln -s libgpgme.so.11 libgpgme.so