--- a/browser/metro/base/content/browser.js
+++ b/browser/metro/base/content/browser.js
@@ -614,19 +614,19 @@ var Browser = {
     } else {
       // Handle setting an cert exception and reloading the page
       try {
         // Add a new SSL exception for this URL
         let uri = Services.io.newURI(json.url, null, null);
         let sslExceptions = new SSLExceptions();
 
         if (json.action == "permanent")
-          sslExceptions.addPermanentException(uri, errorDoc.defaultView);
+          sslExceptions.addPermanentException(uri, window);
         else
-          sslExceptions.addTemporaryException(uri, errorDoc.defaultView);
+          sslExceptions.addTemporaryException(uri, window);
       } catch (e) {
         dump("EXCEPTION handle content command: " + e + "\n" );
       }
 
       // Automatically reload after the exception was added
       aMessage.target.reload();
     }
   },