diff --git a/dom/src/jsurl/nsJSProtocolHandler.cpp b/dom/src/jsurl/nsJSProtocolHandler.cpp
index 6ea26d7c6c9..6223604f8d3 100644
--- a/dom/src/jsurl/nsJSProtocolHandler.cpp
+++ b/dom/src/jsurl/nsJSProtocolHandler.cpp
@@ -280,7 +280,8 @@ nsresult nsJSThunk::EvaluateScript(nsIChannel *aChannel,
         nsIXPConnect *xpc = nsContentUtils::XPConnect();
 
         nsCOMPtr<nsIXPConnectJSObjectHolder> sandbox;
-        rv = xpc->CreateSandbox(cx, principal, getter_AddRefs(sandbox));
+        // Important: Use a null principal here
+        rv = xpc->CreateSandbox(cx, nullptr, getter_AddRefs(sandbox));
         NS_ENSURE_SUCCESS(rv, rv);
 
         // The nsXPConnect sandbox API gives us a wrapper to the sandbox for