CryptoFox is a software package containing Firefox Portable, GNU Privacy Guard, and FireGPG, all pre-configured and ready to use. It provides an easy to use platform for OpenPGP encryption which can be run on any Windows PC, with no installation required.
If you don't already have a PGP keypair, you can generate one by selecting "Tools"->"FireGPG"->"Key manager" from the Firefox menu bar, and clicking on the "New key" button. Fill in your name, email address, a password (also known as a "passphrase"), and when you want the key to expire (I suggest 5 years).
Your passphrase protects your key from unauthorized access by anyone who might use your computer or get ahold of your files, so you should use the longest, most random passphrase that you can remember. You may want to write it down and keep it in a safe place (such as where you would store your passport or other important documents), just in case you forget it. You can find a good method for generating secure, memorable passphrases at diceware.com.
If you already have keys from another installation of GnuPG that you want to use with CryptoFox, copy the pubring.gpg, secring.gpg, and trustdb.gpg files into the "GnuPG" folder that's inside the main CryptoFox folder, replacing any copies that might already be there. GnuPG normally puts these files at "C:\Documents and Settings\[your username]\Application Data\gnupg".
There's a good guide to using FireGPG here.
CryptoFox version 1 consists of:
The latest version of CryptoFox can be found at chrisacheson.net/cryptofox.
FireGPG 0.7.5 will not work if you run CryptoFox from a folder whose full path name contains spaces, such as "My Documents" or the Desktop (which is under "Documents and Settings"), due to this bug. If you get an error about FireGPG being unable to access the GPG executable, try moving the CryptoFox folder to the base folder of your hard drive or USB stick ("C:\", "E:\", etc.) and running it from there.
CryptoFox does not contain any custom code that might compromise your security. If you wish to audit CryptoFox to ensure that its components do not differ from what was released by their respective upstream authors, instructions for doing so can be found in the "Audit" folder, inside the main CryptoFox folder.
CryptoFox is maintained by Chris Acheson. You can find my contact information at chrisacheson.net/contact.