It's 2014. Are we there yet?

[nb.linux]

Jose Simoes:
> PGP/GPG does not work easily with web-mail.
> 
> Most email, today, in read and write using the browser
> 
> POP ou IMAP mail is a rarity
> 
> That is the problem

You (and others) might be interested in the Tails OpenPGP Applet:
https://tails.boum.org/doc/encryption_and_privacy/gpgapplet/

Tails is The Amnesic Incognito Live System, a hardened Live System with Tor.
I'm not sure, but I think that there are plans to include that into Debian.