Can't see option to decrypt my own sent mail in Gmail

[whateverusernameisnottaken]

Hi Kyle:

Just got GnuPG and WebPG installed. Keys appear to be installed.
I was able to encrypt an outgoing message, but can't see any option to later decrypt said message once
it is sent. Is it an issue, or am I missing something?

Windows 7 SP1 x32 with convenience rollup
Firefox 51.0.1
WebPG 0.9.2.1-signed.1-signed

Thanks