Comment 13 for bug 1201954

This indeed is the issue. Initial "patch" . Will post the final patch in a while ( rebuilding is a sloow process ).

--- a/uriloader/exthandler/unix/nsGNOMERegistry.cpp 2014-02-24 23:38:31.303287298 +0530
+++ b/uriloader/exthandler/unix/nsGNOMERegistry.cpp 2014-02-25 00:04:12.643350922 +0530
@@ -148,7 +148,12 @@ nsGNOMERegistry::GetFromType(const nsACS
     nsCOMPtr<nsIGIOMimeApp> gioHandlerApp;
     if (NS_FAILED(giovfs->GetAppForMimeType(aMIMEType, getter_AddRefs(gioHandlerApp))) ||
         !gioHandlerApp) {
- return nullptr;
+ // Unable to find mime handler, probably a protocol. moz bz#947868
+ // Need a better way to identify if this is a scheme - check for nsMIMEInfoBase::eProtocolInfo ?
+ if (NS_FAILED(giovfs->GetAppForURIScheme(aMIMEType, getter_AddRefs(gioHandlerApp))) ||
+ !gioHandlerApp) {
+ return nullptr;
+ }
     }
     gioHandlerApp->GetName(name);
     giovfs->GetDescriptionForMimeType(aMIMEType, description);