diff --git a/extensions/firefox/content/PdfStreamConverter.jsm b/extensions/firefox/content/PdfStreamConverter.jsm
index 2a37d7459cd55..bfb49cff0bf5d 100644
--- a/extensions/firefox/content/PdfStreamConverter.jsm
+++ b/extensions/firefox/content/PdfStreamConverter.jsm
@@ -1008,7 +1008,7 @@ PdfStreamConverter.prototype = {
     // from the request channel to keep isolation consistent.
     var ssm = Cc['@mozilla.org/scriptsecuritymanager;1']
                 .getService(Ci.nsIScriptSecurityManager);
-    var uri = NetUtil.newURI(PDF_VIEWER_WEB_PAGE, null, null);
+    var uri = NetUtil.newURI(PDF_VIEWER_WEB_PAGE);
     var resourcePrincipal =
       ssm.createCodebasePrincipal(uri, aRequest.loadInfo.originAttributes);
     aRequest.owner = resourcePrincipal;