diff --git a/src/js/background.js b/src/js/background.js
index 49776b977..454630cc2 100644
--- a/src/js/background.js
+++ b/src/js/background.js
@@ -84,10 +84,11 @@ return {
         'chrome-extension-scheme',
         'chrome-scheme',
         'loopconversation.about-scheme',
+        'moz-extension-scheme',
         'opera-scheme',
         'vivaldi-scheme',
         ''
-    ].join('\n').trim(),
+    ].join('\n'),
 
     localSettings: {
         blockedRequestCount: 0,