diff --git a/app/manifest.json b/app/manifest.json
index f37d4663d..a821cc4cb 100644
--- a/app/manifest.json
+++ b/app/manifest.json
@@ -26,6 +26,7 @@
   "content_scripts": [
     {
       "matches": [
+        "file://*/*",
         "http://*/*",
         "https://*/*"
       ],