Bug 1663642 - fix. r=kershaw a=RyanVM

Differential Revision: https://phabricator.services.mozilla.com/D90070

netwerk/base/nsStandardURL.cpp

@@ -1497,6 +1497,9 @@ nsresult nsStandardURL::SetSpecWithEncoding(const nsACString& input,
 
   // parse the given URL...
   nsresult rv = ParseURL(spec, specLength);
+  if (mScheme.mLen <= 0) {
+    rv = NS_ERROR_MALFORMED_URI;
+  }
   if (NS_SUCCEEDED(rv)) {
     // finally, use the URLSegment member variables to build a normalized
     // copy of |spec|