Not native
This feature is not built into all browsers. To use it reliably, you'll need to include a JavaScript library in your page as a polyfill. You can include the library from


This function is used in Persona to cause the browser to reset the automatic / persistent login flag for a website. After being called, the user will need to explicitly log back into your site instead of being signed in automatically.

Websites must call this function in the click handler for the site's "log out" button.

This function does not make the browser clear the user's certificate and signing key. So after calling logout(), a new login attempt may or may not ask the user for a new password, depending on the freshness of the certificate their identity provider gave them. However, it will certainly prompt the user to select an email address and confirm that they want to sign in.




// Execute; when the user clicks "Sign Out"
var signoutLink = document.getElementById('signout');

if (signoutLink) {
  signoutLink.onclick = function(event) {


Not included in any specification.

See also


© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

API BrowserID DOM DOM Reference Method Persona Reference Référence Security