diff --git a/platform/firefox/vapi-background.js b/platform/firefox/vapi-background.js
index faaf1a5..7011327 100644
--- a/platform/firefox/vapi-background.js
+++ b/platform/firefox/vapi-background.js
@@ -334,7 +334,7 @@ var tabWatcher = {
 
 /******************************************************************************/
 
-vAPI.isNoTabId = function(tabId) {
+vAPI.isBehindTheSceneTabId = function(tabId) {
     return tabId.toString() === '-1';
 };