I would like to show the fahrplan in an iframe. Please allow

config.json

@@ -8,7 +8,7 @@
   "UriSchemas": [
     ["https", {
       "scope" : ["website"],
-      "allowed" : ["media.ccc.de", "streaming.media.ccc.de", "static.rc3.world", "cdn.c3voc.de"],
+      "allowed" : ["media.ccc.de", "streaming.media.ccc.de", "static.rc3.world", "cdn.c3voc.de", "pretalx.c3voc.de"],
       "blocked" : ["blocked.com"],
       "prefix" : "https:\/\/rc3.world\/2021\/dereferrer\/"
     }],