1 files changed, 11 insertions, 0 deletions
diff --git a/netwerk/protocol/about/nsAboutProtocolHandler.cpp b/netwerk/protocol/about/nsAboutProtocolHandler.cpp
index 5bbaa9010e..ab4d62f989 100644
--- a/netwerk/protocol/about/nsAboutProtocolHandler.cpp
+++ b/netwerk/protocol/about/nsAboutProtocolHandler.cpp
@@ -21,6 +21,7 @@
 #include "nsIChannel.h"
 #include "nsIScriptError.h"
 #include "nsIClassInfoImpl.h"
+#include "DefaultURI.h"
 
 #include "mozilla/ipc/URIUtils.h"
 
@@ -136,6 +137,16 @@ nsresult nsAboutProtocolHandler::CreateNewURI(const nsACString& aSpec,
     NS_ENSURE_SUCCESS(rv, rv);
   }
 
+  // use DefaultURI to check for validity when we have possible hostnames
+  // since nsSimpleURI doesn't know about hostnames
+  auto pos = aSpec.Find("about:/");
+  if (pos != kNotFound) {
+    rv = NS_MutateURI(new mozilla::net::DefaultURI::Mutator())
+             .SetSpec(aSpec)
+             .Finalize(url);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
   url.swap(*aResult);
   return NS_OK;
 }