Firegpg is an iceweasel (mozilla firefox) extension which brings an interface to perform openpgp operations over the web. with it, you can encrypt, decrypt, sign or verify the signature of a text in any web page, including gmail, using gnupg. there are also special buttons that appear specifically in gmail. this extension works fine with any webmail or text box in websites.

firegpg is written in english and french and is currently translated to over 30 languages.