--- a/toolkit/content/widgets/remote-browser.xml
+++ b/toolkit/content/widgets/remote-browser.xml
@@ -375,17 +375,16 @@
 
           // Initialize to the null principal
           let Services = Components.utils.import("resource://gre/modules/Services.jsm", {}).Services
           this._contentPrincipal = Services.scriptSecurityManager.createNullPrincipal({});
 
           this.messageManager.addMessageListener("Browser:Init", this);
           this.messageManager.addMessageListener("DOMTitleChanged", this);
           this.messageManager.addMessageListener("ImageDocumentLoaded", this);
-          this.messageManager.addMessageListener("DocumentInserted", this);
           this.messageManager.addMessageListener("FullZoomChange", this);
           this.messageManager.addMessageListener("TextZoomChange", this);
           this.messageManager.addMessageListener("ZoomChangeUsingMouseWheel", this);
           this.messageManager.addMessageListener("DOMFullscreen:RequestExit", this);
           this.messageManager.addMessageListener("DOMFullscreen:RequestRollback", this);
           this.messageManager.addMessageListener("MozApplicationManifest", this);
           this.messageManager.loadFrameScript("chrome://global/content/browser-child.js", true);