There's FireGPG. It's kinda meh in practice. I ended up going back to using Thunderbird for signed emails (invoices, generally) because it was so fiddly and som

There's FireGPG. It's kinda meh in practice. I ended up going back to using Thunderbird for signed emails (invoices, generally) because it was so fiddly and sometimes just didn't want to work, especially with attachments.