diff --git a/bin/i3-companion b/bin/i3-companion
index ec1a54e..e2df25a 100755
--- a/bin/i3-companion
+++ b/bin/i3-companion
@@ -131,6 +131,7 @@ exclusive_apps = {
     "chromium-browser",
     "google-chrome",
     "thunderbird",
+    "thunderbird-beta",
 }
 intrusive_apps = {"vbeterm"}