Gmail is my favorite email client, that I use it for all my email accounts. It’s web based, and package features that other email clients don’t have (or at least not as good) such as its labels and spam filter. It somehow doesn’t have GPG support to sign and encrypt email.
This is where Firefox and FireGPG come to help. FireGPG is a Firefox extension that features contextual menu giving access to several GPG functions, and brings GPG features to the GMail webmail interface.
To use it, one must first have GPG working on the machine, and Linux user can refer to GnuPG while Windows user can refer Gpg4win to get started.
Once the installations are complete and GPG keys are created, Firefox should have these (working) options when composing emails;
