diff --git a/extension/constants.js b/extension/constants.js
--- a/extension/constants.js
+++ b/extension/constants.js
@@ -42,4 +42,4 @@
 IS_FIREFOX = (typeof InstallTrigger !== "undefined"); // heh.
 
 // NOTE if you change this, make sure to adjust the error message shown in action_popup.html
-SUPPORTED_PLATFORMS = ["linux", "openbsd"];
+SUPPORTED_PLATFORMS = ["linux", "openbsd", "freebsd"];