Enigmail pEp/Enigmail
Location of files
The Enigmail extension itself normally lives inside the Thunderbird profile, and therein in a folder usually named extensions/{847b3a00-7ab1-11d4-8f02-006008948af5}.
Enigmail downloads and unpacks platform-specific ZIPs from a CDN and unpacks them straight into the Thunderbird profile folder.
Examples for pEp:
Downloads for GnuPG:
The adapter binary is then expected to be /pepmda/bin/pep-json-server(.exe), while the current working directory is set to /pepmda/share/pEp. The latter must contain system.db.