diff --git a/chrome/content/zotero/xpcom/mime.js b/chrome/content/zotero/xpcom/mime.js
index dd6f6bf21c..77419507c1 100644
--- a/chrome/content/zotero/xpcom/mime.js
+++ b/chrome/content/zotero/xpcom/mime.js
@@ -103,10 +103,6 @@ Zotero.MIME = new function(){
 	var _nativeMIMETypes = {
 		'text/html': true,
 		'text/css': true,
-		'image/jpeg': true,
-		'image/gif': true,
-		'image/png': true,
-		'image/svg+xml': true,
 		'text/xml': true,
 		'application/xhtml+xml': true,
 		'application/xml': true,