List PostgreSQL extensions per database

I have a Postgres 9.5 server with 30 databases. I would like to find out which database uses which extension(s) in one go, preferably in a query that is usable in pgAdmin. I know that

* FROM pg_extension

gives me the extensions for the database I am connected to. I also know that

* FROM pg_available_extensions

lists, well, all available extensions. I also know that

* FROM pg_database

lists all existing databases. **Question** How can I create a list that includes the database name and the extensions used in each database?