fixup! Bug 23247: Communicating security expectations for .onion

Bug 33298: Warn when submitting form data from http onion sites over an insecure connection

dom/html/HTMLFormElement.cpp

@@ -893,8 +893,11 @@ nsresult HTMLFormElement::DoSecureToInsecureSubmitCheck(nsIURI* aActionURL,
     formIsHTTPS = OwnerDoc()->GetDocumentURI()->SchemeIs("https");
   }
   if (!formIsHTTPS) {
+    bool formIsOnion = nsMixedContentBlocker::IsPotentiallyTrustworthyOnion(OwnerDoc()->GetDocumentURI());
+    if (!formIsOnion) {
       return NS_OK;
     }
+  }
 
   if (nsMixedContentBlocker::IsPotentiallyTrustworthyLoopbackURL(aActionURL)) {
     return NS_OK;