FireGPG - use GPG easily in Firefox !
Select a part of your gmail message, hit “crypt”, and bam! it’s encrypted using GPG. Assuming you have GPG. And assuming you’re using firefox. But you do, and you are, right? You can sign messages too.
The huge downside: you won’t get targeted ads from google based on the text of your message! I know, anything that means you can’t be marketed to as effectively is an abomination. What can I say? It’s the burden of privacy.