diff --git a/platform/thunderbird/manifest.json b/platform/thunderbird/manifest.json
index cb7cccaab..7fd6fad9a 100644
--- a/platform/thunderbird/manifest.json
+++ b/platform/thunderbird/manifest.json
@@ -78,6 +78,7 @@
     "open_in_tab": true
   },
   "permissions": [
+    "alarms",
     "privacy",
     "storage",
     "tabs",