diff --git a/config-overrides.js b/config-overrides.js
index 4826e3b..1058630 100644
--- a/config-overrides.js
+++ b/config-overrides.js
@@ -31,6 +31,7 @@ const extWebpack = (config, env) => {
     popup: paths.appSrc + "/popup.js",
     options: paths.appSrc + "/options.js",
     background: paths.appSrc + "/background.js",
+    backgroundthunderbird: paths.appSrc + "/background.thunderbird.js",
     content: paths.appSrc + "/content.js",
   };