--- qtwebkit/Source/WebKit/qt/WebCoreSupport/FrameLoaderClientQt.cpp.orig	2014-05-27 13:43:36.000000000 +0300
+++ qtwebkit/Source/WebKit/qt/WebCoreSupport/FrameLoaderClientQt.cpp	2014-05-27 13:44:38.000000000 +0300
@@ -1351,7 +1351,7 @@ ObjectContentType FrameLoaderClientQt::o
     if (!mimeType.length())
         mimeType = MIMETypeRegistry::getMIMETypeForExtension(extension);
 
-    if (!mimeType.length())
+    if (!mimeType.length() && canShowMIMEType(mimeType))
         mimeType = PluginDatabase::installedPlugins()->MIMETypeForExtension(extension);
 
     if (!mimeType.length())