diff --git a/testing/marionette/frame.js b/testing/marionette/frame.js
index 2a3eede2eb75..dd0dc5c17115 100644
--- a/testing/marionette/frame.js
+++ b/testing/marionette/frame.js
@@ -51,8 +51,6 @@ frame.Manager = class {
   removeMessageManagerListeners(mm) {
     mm.removeWeakMessageListener("Marionette:switchedToFrame", this.driver);
     mm.removeWeakMessageListener("Marionette:getVisibleCookies", this.driver);
-    mm.removeWeakMessageListener(
-        "Marionette:getImportedScripts", this.driver.importedScripts);
     mm.removeWeakMessageListener("Marionette:GetLogLevel", this.driver);
     mm.removeWeakMessageListener("Marionette:listenersAttached", this.driver);
     mm.removeWeakMessageListener("Marionette:register", this.driver);