diff -r 03f134f17221 uriloader/exthandler/unix/nsMIMEInfoUnix.cpp
--- a/uriloader/exthandler/unix/nsMIMEInfoUnix.cpp	Mon Feb 24 08:31:58 2014 -0500
+++ b/uriloader/exthandler/unix/nsMIMEInfoUnix.cpp	Tue Feb 25 09:43:09 2014 +0530
@@ -53,16 +53,22 @@
     return nsMIMEInfoImpl::GetHasDefaultHandler(_retval);
 
   *_retval = false;
-  nsRefPtr<nsMIMEInfoBase> mimeInfo = nsGNOMERegistry::GetFromType(mSchemeOrType);
-  if (!mimeInfo) {
-    nsAutoCString ext;
-    nsresult rv = GetPrimaryExtension(ext);
-    if (NS_SUCCEEDED(rv)) {
-      mimeInfo = nsGNOMERegistry::GetFromExtension(ext);
+
+
+  if ( mClass ==  eProtocolInfo ) {
+    *_retval = nsGNOMERegistry::HandlerExists (mSchemeOrType.get());
+  } else {
+    nsRefPtr<nsMIMEInfoBase> mimeInfo = nsGNOMERegistry::GetFromType(mSchemeOrType);
+    if (!mimeInfo) {
+      nsAutoCString ext;
+      nsresult rv = GetPrimaryExtension(ext);
+      if (NS_SUCCEEDED(rv)) {
+        mimeInfo = nsGNOMERegistry::GetFromExtension(ext);
+      }
     }
+    if (mimeInfo)
+      *_retval = true;
   }
-  if (mimeInfo)
-    *_retval = true;
 
   if (*_retval)
     return NS_OK;