I'll add some additional information. Chrome inspect to the rescue :-) I don't know what it means. Is it Nginx that needs configuration? Could it be because I still lack the certificate for https?
Refused to execute script from 'https://myserver/static/postorius/libs/jquery/jquery-1.11.3.min.js' because its MIME type ('') is not executable, and strict MIME type checking is enabled. myserver/:1 Refused to execute script from 'https://myserver/static/postorius/libs/bootstrap/js/bootstrap.min.js' because its MIME type ('') is not executable, and strict MIME type checking is enabled. myserver/:1 Refused to execute script from 'https://myserver/static/django-mailman3/js/main.js' because its MIME type ('') is not executable, and strict MIME type checking is enabled. myserver/:1 Refused to execute script from 'https://myserver/static/postorius/js/script.js' because its MIME type ('') is not executable, and strict MIME type checking is enabled.
-rw-r--r-- 1 ubuntu ubuntu 95957 Dec 1 16:18 jquery-1.11.3.min.js