Autocrypt for Thunderbird
E-Mail encryption that gets out of your way. Compatible with Autocrypt and OpenPGP.
Build xpi file with
./configure; make xpi
Notes on the code
This code was originally based on Enigmail. Enough changed that it's no longer compatible with upstream, but in many parts of the codebase this heritage still shows. Don't be surprised if things are internally called "Enigmail" here and there.