diff --git a/extension.json b/extension.json
index b78340c69..54f367d7b 100644
--- a/extension.json
+++ b/extension.json
@@ -120,10 +120,6 @@
 				"multimediaviewer-file-page",
 				"multimediaviewer-options-learn-more",
 				"multimediaviewer-options-dialog-header",
-				"multimediaviewer-option-header-viewer",
-				"multimediaviewer-option-header-filepage",
-				"multimediaviewer-option-desc-viewer",
-				"multimediaviewer-option-desc-filepage",
 				"multimediaviewer-option-submit-button",
 				"multimediaviewer-option-cancel-button",
 				"multimediaviewer-options-text-header",
@@ -211,7 +207,6 @@
 				"multimediaviewer-license-cc-by-sa-2.5",
 				"multimediaviewer-license-cc-by-3.0",
 				"multimediaviewer-license-cc-by-sa-3.0",
-				"multimediaviewer-license-cc-by-sa-3.0-migrated",
 				"multimediaviewer-license-cc-by-4.0",
 				"multimediaviewer-license-cc-by-sa-4.0",
 				"multimediaviewer-license-cc-pd",