diff --git a/js/background.js b/js/background.js
index 6192283..00a2c7a 100644
--- a/js/background.js
+++ b/js/background.js
@@ -114,7 +114,7 @@
   }
 
   function getFilenameFromUrl(url) {
-    return url.split('/').pop().split('?').shift().toLowerCase();
+    return url.split('?').shift().split('/').pop().toLowerCase();
   }
 
   function getExtensionFromFilename(filename) {