Enigform is a Mozilla Firefox extension that provides you the ability to digitally sign HTTP requests, even those generated via AJAX calls. It implements the mechanism described in the white paper entitled OpenPGP Signing for HTTP by Arturo Buanzo Busleiman.
This extension is focused on adding an extra layer of security to the HTTP protocol. There is also a great extension called Enigmail that enhances Mozilla Thunderbird with PGP capabilities. You can check out Enigmail at its Mozdev Page.
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These details are provided for information only. No information here is legal advice and should not be used as such.