diff --git a/platform/firefox/vapi-common.js b/platform/firefox/vapi-common.js
index 949b7e9..14dbbe3 100644
--- a/platform/firefox/vapi-common.js
+++ b/platform/firefox/vapi-common.js
@@ -85,7 +85,7 @@ vAPI.i18n = (function() {
         try {
             return stringBundle.GetStringFromName(s);
         } catch (ex) {
-            return s;
+            return '';
         }
     };
 })();