Browser extension for OpenPGP decryption of an e-mail in Gmail

Question

I sometimes received emails on Gmail that people encrypted using my OpenPGP public key. I am looking for a browser extension that can:

• decrypt e-mails in Gmail using my OpenPGP private key (e.g. automatically or by clicking on some "decrypt" button -> I don't want to have to copy-paste somewhere as I currently do)
• work within the Gmail interface (e.g. I don't want to have to POP/IMAP)

and if possible:

• works with Google Chrome and Microsoft Windows 7
• free

Answer 1

Mymail-Crypt for Gmail™

• Integrates with the GMail interface
• You can decrypt e-mails with a "decrypt" button
  
• gratis
• Works with Windows 7
• "This project is no way affiliated with Google™."

  The project is powered by OpenPGP.js. OpenPGP.js aims to fully implement the RFC 4880 OpenPGP standard. This project is still a work in progress, but supports a variety of key importation/generation abilities to encrypt and decrypt messages. Please see http://openpgpjs.org/ for details on this project.

Answer 2

You can use End-To-End:

• open source and free
• developed by Google
• released on June 3rd, 2014
• supports RFC 4880 (OpenPGP Message Format) and RFC 6637 (Elliptic Curve Cryptography (ECC) in OpenPGP)
• beware it is in beta and may have security issues
• not available in the Chrome Web Store yet

Answer 3

you can use Pandor:

• it's Free for personal use
• you don't have to handle keys exchange with recipients, they recieve automatically an email with an account
• uses OpenPGP for mail encryption.
• Available in chrome Web Store and works with gmail
• you don't have to copy/paste you text somewhere to encrypt/decrypt.This is done automatilly once connected to your pandor account.